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(sin((pi*x)/4))'The calculation above is a derivative of the function f (x)
cos((pi*x)/4)*((pi*x)/4)'
cos((pi*x)/4)*(((pi*x)'*4-(pi*x*(4)'))/(4^2))
cos((pi*x)/4)*((((pi)'*x+pi*(x)')*4-(pi*x*(4)'))/(4^2))
cos((pi*x)/4)*(((0*x+pi*(x)')*4-(pi*x*(4)'))/(4^2))
cos((pi*x)/4)*(((0*x+pi*1)*4-(pi*x*(4)'))/(4^2))
cos((pi*x)/4)*((pi*4-(pi*x*(4)'))/(4^2))
cos((pi*x)/4)*((pi*4-(pi*x*0))/(4^2))
(pi/4)*cos((pi*x)/4)
(pi*cos((pi*x)/4))/4
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