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Cos2(a)+cos2(b)+cos2(c)=1. TG -2п/3. Cos a b cos a b cos2a sin2b. 4cos 3п-b -sin 3п/2+b /5cos.
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Cos2(a)+cos2(b)+cos2(c)=1. TG -2п/3. Cos a b cos a b cos2a sin2b. 4cos 3п-b -sin 3п/2+b /5cos. 