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PolinkaTaraeva
@PolinkaTaraeva
March 2022
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Sin 2 (180-3a)*sin (3a-90)/sin (360-3a) *ctg (180-3a)
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sedinalana
Sin 2 (180-3a)*sin (3a-90)/sin (360-3a) *ctg (180-3a)=
=sin
²3a*(-cos3a)/(-sin3a)*(-ctg3a)=-cos²3a
-------------------------------------------
если ctgв знаменателе,то ответ -sin²3a
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Answers & Comments
=sin²3a*(-cos3a)/(-sin3a)*(-ctg3a)=-cos²3a
-------------------------------------------
если ctgв знаменателе,то ответ -sin²3a