# CBSE Class 10-Mathematics: Chapter –8 Introduction to Trigonometry Part 14

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**Question5:**

Prove the following identities, where the angles involved are acute angles for which the expressions are defined:

(i)

(ii)

(iii)

(iv)

(v) , using the identity

(vi)

(vii)

(viii)

(ix)

(x)

**Answer:**

Proof:

(i)

L.H.S.

(ii)

L.H.S.

(iii)

L.H.S.

(iv)

L.H.S.

(v) , using the identity

Dividing all terms by

(vi)

L.H.S.

(vii)

(viii)

L.H.S.

(ix)

L.H.S.

Dividing all the terms by

(x)

L.H.S.

Now, Middle side