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(6*cos(2*pi*x-(pi/2)))'The calculation above is a derivative of the function f (x)
(6)'*cos(2*pi*x-(pi/2))+6*(cos(2*pi*x-(pi/2)))'
0*cos(2*pi*x-(pi/2))+6*(cos(2*pi*x-(pi/2)))'
0*cos(2*pi*x-(pi/2))+6*-sin(2*pi*x-(pi/2))*(2*pi*x-(pi/2))'
0*cos(2*pi*x-(pi/2))+6*-sin(2*pi*x-(pi/2))*((2*pi*x)'+(-(pi/2))')
0*cos(2*pi*x-(pi/2))+6*-sin(2*pi*x-(pi/2))*(2*pi*(x)'+(2*pi)'*x+(-(pi/2))')
0*cos(2*pi*x-(pi/2))+6*-sin(2*pi*x-(pi/2))*(2*pi*(x)'+0*x+(-(pi/2))')
0*cos(2*pi*x-(pi/2))+6*-sin(2*pi*x-(pi/2))*(0*x+2*pi*1+(-(pi/2))')
0*cos(2*pi*x-(pi/2))+6*2*pi*(-sin(2*pi*x-(pi/2)))
0*cos(2*pi*x-(pi/2))+6*-2*pi*sin(2*pi*x-(pi/2))
-12*pi*sin(2*pi*x-(pi/2))
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