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NCERT Solutions for Exercise 8.2 Class 10 Maths Chapter 8 - Introduction to Trigonometry

NCERT Solutions for Exercise 8.2 Class 10 Maths Chapter 8 - Introduction to Trigonometry

Edited By Ramraj Saini | Updated on Nov 27, 2023 08:56 AM IST | #CBSE Class 10th

NCERT Solutions For Class 10 Maths Chapter 8 Exercise 8.2

NCERT Solutions for Exercise 8.2 Class 10 Maths Chapter 8 Introduction to Trigonometry are discussed here. These NCERT solutions are created by subject matter expert at Careers360 considering the latest syllabus and pattern of CBSE 2023-24. Class 10 maths ex 8.2 deal trigonometric ratios and ratios of particular specific angles such as 0, 30, 45, 60 and 90 degrees. The ratios of the sides of a right triangle to their sharp angles are known as trigonometric ratios. The hypotenuse, which is the longest side of the right angle triangle, the perpendicular, which is the opposite side to the right angle triangle's angle, and the base, which is the next side to the right angle triangle's angle are the three sides of the right angle triangle.

This Story also Contains
  1. NCERT Solutions For Class 10 Maths Chapter 8 Exercise 8.2
  2. Download Free Pdf of NCERT Solutions for Class 10 Maths chapter 8 exercise 8.2
  3. Assess NCERT Solutions for Class 10 Maths chapter 8 exercise 8.2
  4. More About NCERT Solutions for Class 10 Maths Exercise 8.2:
  5. Benefits of NCERT Solutions for Class 10 Maths Exercise 8.2:
  6. NCERT Solutions Subject Wise
  7. Subject Wise NCERT Exemplar Solutions
NCERT Solutions for Exercise 8.2 Class 10 Maths Chapter 8 - Introduction to Trigonometry
NCERT Solutions for Exercise 8.2 Class 10 Maths Chapter 8 - Introduction to Trigonometry

NCERT solutions for exercise 8.2 Class 10 Maths chapter 8 Introduction to Trigonometry focuses on trigonometry and trigonometric ratios including sine, cosine, tangent, cosecant, secant and cotangent for specific angle. 10th class Maths exercise 8.2 answers are designed as per the students demand covering comprehensive, step by step solutions of every problem. Practice these questions and answers to command the concepts, boost confidence and in depth understanding of concepts. Students can find all exercise together using the link provided below.

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Introduction to Trigonometry class 10 chapter 8 Exercise: 8.2

Q1 Evaluate the following :

(i) \sin 60^{o}\cos 30^{o}+\sin30^{o} \cos 60^{o}

Answer:

\sin 60^{o}\cos 30^{o}+\sin30^{o} \cos 60^{o}
As we know,
the value of \sin 60^0 = \sqrt{3}/2 = \cos 30^0 , \sin 30^0 = 1/2=\cos 60^0
\\\Rightarrow \frac{\sqrt{3}}{2}.\frac{\sqrt{3}}{2}+ \frac{1}{2}.\frac{1}{2}\\
=\frac{3}{4}+\frac{1}{4}
=1

Q1 Evaluate the following :

(ii)\: 2\tan ^{2}45^{o}+ 2\cos ^{2}30^{o}- 2\sin ^{2}60^{o}

Answer:

We know the value of

\tan 45^0 = 1 and

\cos 30^0 = \sin 60^0 = \frac{\sqrt{3}}{2}
According to question,

=2\tan ^{2}45^{o}+ 2\cos ^{2}30^{o}- 2\sin ^{2}60^{o}
\\=2(1)^2+ (\frac{\sqrt{3}}{2})^2-(\frac{\sqrt{3}}{2})\\=2

Q1 Evaluate the following :

(iii)\: \frac{\cos 45^{o}}{\sec 30^{o}+\csc 30^{o}}

Answer:

\frac{\cos 45^{o}}{\sec 30^{o}+\csc 30^{o}}
we know the value of

\cos 45 = 1/\sqrt{2} , \sec 30^0 = 2/\sqrt {3} and cosec \:30 =2 ,

After putting these values
=\frac{\frac{1}{\sqrt{2}}}{\frac{2}{\sqrt{3}}+2}
=\frac{1/\sqrt{3}}{(2+2\sqrt{3})/ \sqrt{3}}
\\=\frac{\sqrt{3}}{2\sqrt{2}+2\sqrt{6}}\times\frac{2\sqrt{2}-2\sqrt{6}}{2\sqrt{2}-2\sqrt{6}}
\\=\frac{2\sqrt{6}-2\sqrt{18}}{-16}\\ =2\frac{\sqrt{6}-3\sqrt{3}}{-16} = \frac{3\sqrt{3}-\sqrt{6}}{8}

Q1 Evaluate the following :

(iv)\: \frac{\sin 30^{o}+\tan 45^{o}-cosec 60^{o}}{\sec 30^{o}+\cos 60^{o}+\cot 45^{o}}

Answer:

\frac{\sin 30^{o}+\tan 45^{o}-cosec 60^{o}}{\sec 30^{o}+\cos 60^{o}+\cot 45^{o}} ..................(i)
It is known that the values of the given trigonometric functions,
\\\sin 30^0 = 1/2=cos 60^0\\ \tan 45^0 = 1=\cot 45^0\\ \sec 30^0 = 2/\sqrt{3}=cosec 60^0\\
Put all these values in equation (i), we get;
\\\Rightarrow \frac{1/2+1-2/\sqrt{3}}{2/\sqrt{3}+1/2+1}\\ \Rightarrow\frac{3/2-2/\sqrt{3}}{3/2+2/\sqrt{3}}\\ \Rightarrow \frac{3\sqrt{3}-4}{3\sqrt{3}+4}\times\frac{4-3\sqrt{3}}{4-3\sqrt{3}}\\ \Rightarrow \frac{12\sqrt{3}-27-16+12\sqrt{3}}{-11}\\ \Rightarrow \frac{43-24\sqrt{3}}{11}

Q1 Evaluate the following :

(v)\frac{5\cos^{2}60^{o}+ 4\sec^{2}30^{o}-\tan^{2}45^{o}}{\sin^{2}30^{o}+\cos^{2}30^{o}}

Answer:

\frac{5\cos^{2}60^{o}+ 4\sec^{2}30^{o}-\tan^{2}45^{o}}{\sin^{2}30^{o}+\cos^{2}30^{o}} .....................(i)
We know the values of-
\\\cos 60^0 = 1/2= \sin 30^0\\ \sec 30^0 = 2/\sqrt{3}\\ \tan 45^0 = 1\\ \cos 30^0 = \sqrt{3}/2
By substituting all these values in equation(i), we get;

\\\Rightarrow \frac{5.(\frac{1}{2})^2+4.(\frac{2}{\sqrt{3}}) ^2-1}{(\frac{1}{2})^2+(\frac{\sqrt{3}}{2})^2}\\ \Rightarrow \frac{5/4-1+16/3}{1}\\ \Rightarrow \frac{1/4+16/3}{1}\\ \Rightarrow\frac{67}{12}

Q2 Choose the correct option and justify your choice :

(i)\, \frac{2\: \tan 30^{o}}{1+\tan ^{2}30^{o}}=

(A)\: \sin 60^{o} (B)\: \cos 60^{o} (C)\: \tan 60^{o} (D)\: \sin 30^{o}

Answer:

Put the value of tan 30 in the given question-
\frac{2\: \tan 30^{o}}{1+\tan ^{2}30^{o}}=\frac{2\times1/\sqrt{3}}{1+(1/\sqrt{3})^2}=\frac{2}{\sqrt{3}}\times \frac{3}{4}=\sqrt{3}/2 = \sin 60^0

The correct option is (A)

Q2 Choose the correct option and justify your choice :

(ii)\: \frac{1-\tan^{2}45^{o}}{1+ \tan^{2}45^{o}}=

(A)\: \tan \: 90^{o} (B)\: 1 (C) \: \sin 45^{o} (D) \: 0

Answer:

The correct option is (D)
\frac{1-\tan^{2}45^{o}}{1+ \tan^{2}45^{o}}=
We know that \tan 45 = 1
So, \frac{1-1}{1+1}=0

Q2 Choose the correct option and justify your choice :

(iii)\sin \: 2A=2\: \sin A is true when A =

(A)0^{o} (B)\: 30^{o} (C)\: 45^{o} (D)\: 60^{o}

Answer:

The correct option is (A)
\sin \: 2A=2\: \sin A
We know that \sin 2A = 2\sin A \cos A
So, 2\sin A \cos A = 2\sin A
\\\cos A = 1\\ A = 0^0

Q2 Choose the correct option and justify your choice :

(iv)\frac{2\: \tan 30^{o}}{1-tan^{2}\: 30^{o}}=

(A)\: \cos 60^{o} (B)\: \sin 60^{o} (C)\: \tan 60^{o} (D)\: \sin 30^{o}

Answer:

Put the value of tan 30^{o}={\1/\sqrt{3}}

\\=\frac{2\: \tan 30^{o}}{1-tan^{2}\: 30^{o}}=\frac{2\times 1/\sqrt{3}}{1-(\frac{1}{\sqrt{3}})^2}\\ =\frac{2/\sqrt{3}}{1-1/3}\\ =\frac{2}{\sqrt{3}}\times \frac{3}{2}\\ =\sqrt{3}= \tan 60^0

The correct option is (C)

Q3 If \tan (A+B)=\sqrt{3} and \tan (A-B)= \frac{1}{\sqrt{3}}; 0^{o}<A+B\leq 90^{o};A> B, find A \: and \: B.

Answer:

Given that,
\tan (A+B) = \sqrt{3} =\tan 60^0
So, A + B = 60^o ..........(i)
\tan (A-B) = 1/\sqrt{3} =\tan 30^0
therefore, A - B = 30^o .......(ii)
By solving the equation (i) and (ii) we get;

A = 45^o and B = 15^o

Q4 State whether the following are true or false. Justify your answer.

(i) \sin (A + B) = \sin A + \sin B
(ii) The value of \sin \theta increases as \theta increases.
(iii) The value of \cos \theta increases as \theta increases.
(iv)\sin \theta =\cos \theta for all values of \theta .
(v) \cot A is not defined for A=0^{o}

Answer:

(i) False,
Let A = B = 45^0
Then, \\\sin(45^0+45^0) = \sin 45^0+\sin 45^0\\ \sin 90^ = 1/\sqrt{2}+q/\sqrt{2}\\ 1 \neq \sqrt{2}


(ii) True,
Take \theta = 0^0,\ 30^0,\ 45^0
whent
\theta = 0 then zero(0),
\theta = 30 then value of \sin \theta is 1/2 = 0.5
\theta = 45 then value of \sin \theta is 0.707


(iii) False,
\cos 0^0 = 1,\ \cos 30^0 = \sqrt{3}/2= 0.87,\ \cos 45^0 = 1\sqrt{2}= 0.707


(iv) False,
Let \theta = 0
\\\sin 0^0 = \cos 0^0\\ 0 \neq 1

(v) True,
\cot 0^0 = \frac{\cos 0^0}{\sin 0^0}=\frac{1}{0} (not defined)

More About NCERT Solutions for Class 10 Maths Exercise 8.2:

The link between the trigonometric ratios was also covered in the NCERT solutions for Class 10 Maths exercise 8.2. The Trigonometric ratios of particular specific angles were the focus of NCERT book exercise 8.2 Class 10 Maths. The Trigonometric ratios of some specific angles are the ratios of the sides of a right-angle triangle with regard to any of its acute angles. The trigonometric ratios of some specific angles are 0°, 30°, 45°, 60° and 90°. The following table lists the six trigonometric ratios for angles 0°, 30°, 45°, 60° and 90°.

\angle A

0^o

30^o

45^o

60^o

90^o

Sin A

0

\frac{1}{2}

\frac{1}{\sqrt{2}}

\frac{\sqrt{3}}{2}

1

Cos A

1

\frac{\sqrt{3}}{2}


\frac{1}{2}

0

Tan A

0

\frac{1}{\sqrt{3}}

1

\sqrt{3}

Not defined

Cosec A

Not defined

2

\sqrt{2}

\frac{2}{\sqrt{3}}

1

Sec A

1

\frac{2}{\sqrt{3}}

\sqrt{2}

2

Not defined

Cot A

Not defined

\sqrt{3}

1

\frac{1}{\sqrt{3}}

0

Usage of Pythagoras theorem is also covered in Exercise 8.2 Class 10 Maths. Students can use these Introduction to Trigonometry Class 10 notes to quick revision of the important concepts discussed in this chapter.

Benefits of NCERT Solutions for Class 10 Maths Exercise 8.2:

  • NCERT solutions for Class 10 Maths exercise 8.2 can be used in astronomy to measure the distance to nearby stars as well as in satellite navigation systems.
  • Exercise 8.2 Class 10 Maths, is also used in the calculation of lengths, areas, and relative angles between objects.
  • NCERT solution for Class 10 Maths chapter 8 exercise 8.2 will help students attain a good score in term exams and help in further higher studies.

Also, see-

NCERT Solutions Subject Wise

Subject Wise NCERT Exemplar Solutions

Frequently Asked Questions (FAQs)

1. What is the value of cos60° sin30° + sin60°cos30° ?

cos60° sin30° + sin60°cos30°  

=1/4+3/4=4/4

=1 

2. What is the value of cos 3 π?

The value of cos 3π is cos(π+2π) 

=cos(π) =-1

3. What is the value of tan 45° ?

The value of tan 45° is 1 

4. State true or false. The trigonometric function that is equal to the ratio of the side opposite a given angle to the hypotenuse is called sine.

Yes, the given assertion is correct. The sine is the ratio of the opposing side to the hypotenuse of a right-angle triangle. 

Sin θ denotes the opposite side/hypotenuse 

5. Say yes/no. Whether the value of cos 30° is equal to sin 60°

Yes, the value of cos 30° is equal to sin 60°. 

6. What is the value of cosec 0° ?

The value of cosec 0° is not defined. 

7. According to NCERT solutions for Class 10 Maths chapter 8 exercise 8.2 , What are the trigonometric ratios of specific angles?

The Trigonometric ratios of some specific angles are the ratios of the sides of a right-angle triangle with regard to any of its acute angles.

8. According to NCERT solutions for Class 10 Maths chapter 8 exercise 8.2 , what are the six trigonometric ratios ?

The six trigonometric ratios are Sine  , Cosine , Tangent , Cotangent , Cosecant   and Secant.

9. How many questions are there in the NCERT solutions for Class 10 Maths chapter 8 exercise 8.2 and what types of questions are there ?

NCERT solutions for Class 10 Maths chapter 8 exercise sides 8.2 consist of 4 questions and all the 4 questions are based on trigonometric ratios of specific angles.

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show the previous year exams ?

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i had cleared 10th from cbse in 2022 2 years ago now i wish to apply for 12th as private candidate in 2025. can i do so?

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Ashvadha 03 July,2024
i had cleared 10th in 2022 from cbse can i apply for 12th as private candidate this year?

According to cbse norms candidates who have completed class 10th, class 11th, have a gap year or have failed class 12th can appear for admission in 12th class.for admission in cbse board you need to clear your 11th class first and you must have studied from CBSE board or any other recognized and equivalent board/school.

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