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аяу14
@аяу14
July 2022
1
4
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cos^2a-4sin^2a/2cos^2a/2
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vavem
Cos^2a -4 sin^2a/2cos^2 а/2= cos^2a -4*(1-cosa)(1+cosa)/4=cos^2a-1+cos^2a=cos^2a-sin^2a=cos2a
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