Question - Trigonometric Identities

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ConceptTrigonometric Identities

Question

Prove the following identities:

(i) cos4^4 A – cos^2 A = sin^4 A – sin^2 A

(ii) cot^4 A – 1 = cosec^4 A – 2cosec^2 A

(iii) sin^6 A + cos^6 A = 1 – 3sin^2 A cos^2 A.

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