1)1cos17*cos13*-sin17*sin13*2)sin 38* cos 22*+cos38*sin22*(*-це градуси). Created by nakarnuk. algebra-ru

1)1cos17*cos13*-sin17*sin13*2)sin 38* cos 22*+cos38*sin22*(*-це градуси)...

August 2022 2 1 Report

1)1cos17*cos13*-sin17*sin13*
2)sin 38* cos 22*+cos38*sin22*
(*-це градуси)

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1)Используем формулу косинуса суммы:

cos17°cos13°-sin17°sin13°= cos (17°+13°)= cos 30°= √3/2

2)Используем формулу синуса суммы:

sin 38°cos 22°+cos38°sin22°= sin (38°+22°)= sin 60°= √3/2

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