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