cos(x-pi/4)=0
x-pi/4=pi/2+pi*n
x=pi/4+pi/2+pi*n
x=3*pi/4+pi*n
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cos(x-pi/4)=0
x-pi/4=pi/2+pi*n
x=pi/4+pi/2+pi*n
x=3*pi/4+pi*n