cos(П/2+x) - sin(П-x) = 1
-sinx-sinx=1
-2sinx=1
sinx=-1/2
x=((-1)^k+1)*п/6+пk
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-sinx-sinx=1
-2sinx=1
sinx=-1/2
x=((-1)^k+1)*п/6+пk