cos13cos35+cos77cos55-cos22. Created by Ulker99. algebra-ru

cos13cos35+cos77cos55-cos22...

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cos13cos35+cos77cos55-cos22

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Cos13*cos35+cos77*cos55-cos22=0

1. cos13=cos(90-77)=sin77
2. cos35=cos(90-55)=sin55
3. cos13*cos35+cos77*cos55-cos22=sin77*sin55+cos77*cos55-cos22=
=cos(77-55)-cos22=cos22-cos22=0

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okneret

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Использованы: формулы приведения, формулы сложения

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