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(4*cos(4*x))'The calculation above is a derivative of the function f (x)
(4)'*cos(4*x)+4*(cos(4*x))'
0*cos(4*x)+4*(cos(4*x))'
0*cos(4*x)+4*-sin(4*x)*(4*x)'
0*cos(4*x)+4*-sin(4*x)*((4)'*x+4*(x)')
0*cos(4*x)+4*-sin(4*x)*(0*x+4*(x)')
0*cos(4*x)+4*-sin(4*x)*(0*x+4*1)
0*cos(4*x)+4*4*(-sin(4*x))
0*cos(4*x)+4*-4*sin(4*x)
-16*sin(4*x)
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