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Question

If sin2A + cos2A =1 then sin4A + cos4A will also be equal to 1. Or sinA +cosA will also be equal to 1.

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Solution

No, both sin4A + cos4A and sinA +cosA will not be equal to 1.
in the case of sin4A + cos4A

it must be less than 1
and in the case of sinA + cos A it must be greater than 1

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