Question

if sina+sin^2=1 prove that cosa^2+cosa^4=1

Answer 1

Heya...

Here is ur answer..

Answer 2

sina+sin2a=1

⇒sina=1−sin2a

⇒sina=cos2a

⇒sin2a=cos4a

⇒1−cos2a=cos4a

⇒cos2a+cos4a=1

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