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CathyRey
@CathyRey
July 2022
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Тригонометрия. 1 пример. Срочно, пожалуйста. Полное решение.
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rskopov
Решение:
cos2a+sin2a*tga=cos2a+2sinacosa*sina/cosa=cos2a+2sin^2a=cos^2a-sin^2a+2sin^2a=cos^2a+sin^2a=1.
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Answers & Comments
cos2a+sin2a*tga=cos2a+2sinacosa*sina/cosa=cos2a+2sin^2a=cos^2a-sin^2a+2sin^2a=cos^2a+sin^2a=1.