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18.10.2020 •
Mathematics
Cos^4 (A/2)- sin^4(A/2)=cosA
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Ответ:
LHS=cos^4(A/2)-sin^4(A/2)
={cos^2(A/2)}^2 -{sin^2(A/2)}^2
={cos^2(A/2) - sin^2(A/2)}{cos^2(A/2) +sin^2(A/2)}
=cosA×1
=cosA
Ответ: