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ratatyf
@ratatyf
July 2022
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(sin п/10 * sin п/5 + cos п/10 * cos п/5) / (sin п/5 * sin 2п/15 - cos п/5 * cos 2п/15)
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Nargiza9501
Есть формула: cos(x+y)=cosx×cosy-sinx×siny
cos(x-y)=cosx×cosy+sinx×siny
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Answers & Comments
cos(x-y)=cosx×cosy+sinx×siny