решить уравнения
cos^2(pi-x)+8cos(pi+x)+7=0
2cos^2(x-pi)+3sin(pi+x)=0
3sin^2(x-3pi/2)-cos(x+4pi)=0
2tg^2(3pi/2+x)+3tg(pi/2+x)=0
2sin^2 x+5sin(3pi/2-x)-2=0
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