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