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HotPeper
@HotPeper
August 2022
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ctg(-a)*tg(-a)-san^2(-a)
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MrCalling
Verified answer
Ctg(-a)*tg(-a)-sin²(-a)=ctga*tga-sin²a=1-sin²a=cos²a
Ответ cos²a
1 votes
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HotPeper
1-sin²a можешь пж обяснить этот момент откуда такой ответ взялся
sedinalana
Verified answer
Ctg(-a)*tg(-a)-sin²(-a)=1-sin²a=cos²a
------------------------------
tgx*ctgx=1
sin²x+cos²x=1
sin²(-x)=sin²x
0 votes
Thanks 0
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Answers & Comments
Verified answer
Ctg(-a)*tg(-a)-sin²(-a)=ctga*tga-sin²a=1-sin²a=cos²aОтвет cos²a
Verified answer
Ctg(-a)*tg(-a)-sin²(-a)=1-sin²a=cos²a------------------------------
tgx*ctgx=1
sin²x+cos²x=1
sin²(-x)=sin²x