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Prove the following identities: tan2 A – sin2 A = tan2 A . sin2 A - Mathematics

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Question

Prove the following identities:

tan2 A – sin2 A = tan2 A . sin2 A

Sum
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Solution

L.H.S. = tan2 A – sin2 A

= `sin^2A/cos^2A - sin^2A/1`

= `(sin^2A - sin^2A cos^2A)/(cos^2A)`

= `(sin^2A(1 - cos^2A))/cos^2A`

= `sin^2A/cos^2A (1 - cos^2A)`

= tan2 A sin2 A   ...(∵ 1 – cos2 A = sin2 A)

= R.H.S.

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