15баллов!1 пример!Помогите решить!. Created by MrSaint. algebra-ru

15баллов!1 пример!Помогите решить!...

December 2021 2 13 Report

15баллов!1 пример!Помогите решить!

Лавган $\frac{1-2sin^254}{8\cdot tg\, 9\cdot sin^299} = \frac{1-(1-2cos108)}{8\cdot tg\, 9\cdot sin^2(90+9)} = \frac{2cos(90+18)}{8\cdot \frac{sin\, 9}{cos\, 9}\cdot cos^2\, 9} = \frac{-2sin18}{8\cdot sin\, 9\cdot cos\, 9} =\\\\= \frac{-2sin18}{4\cdot (2\, sin\, 9\cdot cos\, 9)} =\frac{-2sin\, 18}{4\cdot sin18} =-\frac{1}{2}$

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