# NCERT Solutions for Class 10 Maths Exercise 8.2

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NCERT solutions for Maths Introduction to Trigonometry

## NCERT Solutions for Class 10 Maths Introduction to Trigonometry

###### 1. Evaluate:

(i)

(ii)

(iii)

(iv)

(v)

Ans. (i)

=

= =1

(ii)

=

= =2

(iii)

= =

= =

=

= =

=

(iv)

= = =

=

= =

(v)

=

=

= =

NCERT Solutions for Class 10 Maths Exercise 8.2

###### 2. Choose the correct option and justify:

(i) =

(A)

(B)

(C)

(D)

(ii) =

(A)

(B) 1

(C)

(D) 0

(iii) is true when A =

(A)

(B)

(C)

(D)

(iv) =

(A)

(B)

(C)

(D) Non e of these

Ans. (i) (A)

=

= = =

(ii) (D) = = = 0

(iii) (A) Since A = 0, then

and

=

when A = 0

(iv) (C)

= =

= =

NCERT Solutions for Class 10 Maths Exercise 8.2

###### 3. If and find A and B.

Ans.

A + B = ……….(i)

A – B = ……….(ii)

On adding eq. (i) and (ii), we get,

2A = A =

On Subtracting eq. (i) and eq. (ii), we get

2B = B =

NCERT Solutions for Class 10 Maths Exercise 8.2

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

(i)

(ii) The value of increases as increases.

(iii) The value of increases as increases.

(iv) for all values of

(v) is not defined for

Ans. (i) False, because

= 1

And =

(ii) True, because

It is clear, the value of increases as increases.

(iii) False, because

It is clear, the value of decreases as increases

(iv) False as it is only true for

(v) True, because and

= i.e. undefined.

## NCERT Solutions for Class 10 Maths Exercise 8.2

NCERT Solutions Class 10 Maths PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 10 Maths includes text book solutions from Mathematics Book. NCERT Solutions for CBSE Class 10 Maths have total 15 chapters. 10 Maths NCERT Solutions in PDF for free Download on our website. Ncert Maths class 10 solutions PDF and Maths ncert class 10 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.

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