Mathematics
Mathematics, 06.08.2019 09:10, allstar976

Prove cos^4 x +sin^4 x= 2cos^2 x for any acute angle


Prove cos^4 x +sin^4 x= 2cos^2 x for any acute angle

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Prove cos^4 x +sin^4 x= 2cos^2 x for any acute angle
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