Question

найдите значение выражения
-13sin174°/cos 87°*cos 3°

Answer 1

Ответ

-26

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Answer 2

$\frac{-13Sin174^{o}} {Cos87^{o}*Cos3^{o}}=\frac{-13Sin(180^{o}-6^{o})}{Cos(90^{o}-3^{o})*Cos3^{o}}= \frac{-13Sin6^{o}} {Sin3^{o}*Cos3^{o}}= \frac{-26Sin6^{o}} {Sin6^{o}}=-26$