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Cos2(a)+cos2(b)+cos2(c)=1. Cos(2a+2b). Sin2b+cos2b. Sin⁴b+sin²b*cos²b.
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Cos2(a)+cos2(b)+cos2(c)=1. Cos(2a+2b). Sin2b+cos2b. Sin⁴b+sin²b*cos²b. 