решите уравнение: sin2x + 2cos^2x=0. Created by Alisha1610. algebra-ru

решите уравнение: sin2x + 2cos^2x=0...

July 2022 2 5 Report

решите уравнение: sin2x + 2cos^2x=0

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$sin2x+2cos^2x=0\\
2sinx*cosx+2cos^2x=0\\
2sinx*cosx=-2cos^2x\\
2cosx(cosx+sinx)=0\\
cosx=0\\
x=\frac{\pi}{2}+\pi\*k\\
cosx=-sinx\\
tgx=-1\\
 x=-\frac{\pi}{4}+\pi\*k
$

47 votes Thanks 202

Nik133

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$sin2x + 2cos^2x=0 \\ \\ 2sinxcosx+2cos^2x=0 \\ \\ 2cosx(sinx+cosx)=0 \\ \\ cosx=0 \\ \\ x_1=\frac{\pi}{2}+\pi n,\ \ \ \ \ n \in Z \\ \\ sinx+cosx=0 \\ \\ tgx+1=0 \\ \\ tgx=-1 \\ \\ x_2=-\frac{\pi}{4}+\pi n,\ \ \ \ \ n \in Z$

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