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Kkkr111
@Kkkr111
June 2022
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Помогите, пожалуйста, с математикой!!!! Очень нужна ваша помощь!
Доказать тождество:
1) cos^2a=sin a*ctg a
2) sin a=cos a*tg a
3) ctg a/tg a+1=1/sin^2a
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Сыльги
2)sin a=cos a×sina/cos a=sin a
3)cos a/sin a÷sin a/cos a+1=cos^2 a/sin^2 a+1=cos^2 a+sin^2 a/sin^2 a=1/sin^2 a
1)sin a×cos a/sina =cos a
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Answers & Comments
3)cos a/sin a÷sin a/cos a+1=cos^2 a/sin^2 a+1=cos^2 a+sin^2 a/sin^2 a=1/sin^2 a
1)sin a×cos a/sina =cos a