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Mathematics, 08.03.2021 14:10 Nismo3501037

Cos(A+60°) * cos(A-60°) - sin(A+60°) * sin(A+60°) = cos2A

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Cos(A+60°) * cos(A-60°) - sin(A+60°) * sin(A+60°) = cos2A...
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