2sinx cosx=cosx cos(pi/2)-sinx sin(pi/2)
2sinx cosx=0-sinx
sinx(2cosx+1)=0
sinx=0 x=piK(К-целое)
2cosx+1=0 cosx=-1/2 x=+-2pi/3+2piK
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2sinx cosx=cosx cos(pi/2)-sinx sin(pi/2)
2sinx cosx=0-sinx
sinx(2cosx+1)=0
sinx=0 x=piK(К-целое)
2cosx+1=0 cosx=-1/2 x=+-2pi/3+2piK