Ответы на вопрос:
Tga = 1/ctga = 15/8 tga = sina/cosa = 15/8 = 1,875 sina = 1,875cosa cosa = -√(1-sin²a) sina = -15/8√(1-sin²a) sin²a = 225/64(1-sin²a) 289/64sin²a = 225/64 sin²a = 225/289 sina = -15/17 cosa = -√(1-225/289)=-8/17 ответ: -15/17; 15/8; -8; 17
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