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(6*cos((pi/4)*x))'The calculation above is a derivative of the function f (x)
(6)'*cos((pi/4)*x)+6*(cos((pi/4)*x))'
0*cos((pi/4)*x)+6*(cos((pi/4)*x))'
0*cos((pi/4)*x)+6*-sin((pi/4)*x)*((pi/4)*x)'
0*cos((pi/4)*x)+6*-sin((pi/4)*x)*((pi/4)'*x+(pi/4)*(x)')
0*cos((pi/4)*x)+6*-sin((pi/4)*x)*(0*x+(pi/4)*(x)')
0*cos((pi/4)*x)+6*-sin((pi/4)*x)*(0*x+(pi/4)*1)
0*cos((pi/4)*x)+6*(pi/4)*(-sin((pi/4)*x))
0*cos((pi/4)*x)+6*((-(pi*sin((pi*x)/4)))/4)
(-3/2)*pi*sin((pi*x)/4)
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