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(sin(x-(pi/4)))'The calculation above is a derivative of the function f (x)
cos(x-(pi/4))*(x-(pi/4))'
cos(x-(pi/4))*((x)'+(-(pi/4))')
((-(pi/4))'+1)*cos(x-(pi/4))
1*cos(x-(pi/4))
cos(x-(pi/4))
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