Prove each of the following identities:
(1 + tan²θ) sin²θ = tan²θ.
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(1 + tan²θ) sin²θ = tan²θ.
LHS
= (1 + tan²θ) sin²θ
= sec²θ .sin²θ
=1/cos²θ .sin²θ
=sin²θ /cos²θ
= tan²θ
= RHS
proved......!
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