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