Solve: (1 + tan2A) / (1 + cot2A) = [(1 - tan A) /(1 - cotA)]2= tan2A.

1.	Solve: (1 + tan2A) / (1 + cot2A) = [(1 - tan A) /(1 - cotA)]2= tan2A.
Answer» (1 + tan²A) / (1 + cot²A) = [(1 - tan A) /(1 - cotA)]²= tan²A. Trigonometric Identitiesare the equations that are true for right-angled triangles. We can use different trigonometric identities to prove the above expression.

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