2*sin(x)=-sqrt(2)
sin(x)=-sqrt(2)/2
x=(-1)^n*arcsin(sqrt(2)/2))+pi*n
x=5*pi/4+pi*n
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2*sin(x)=-sqrt(2)
sin(x)=-sqrt(2)/2
x=(-1)^n*arcsin(sqrt(2)/2))+pi*n
x=5*pi/4+pi*n