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((3*cos(2*x))/3)'The calculation above is a derivative of the function f (x)
((3*cos(2*x))'*3-(3*cos(2*x)*(3)'))/(3^2)
(((3)'*cos(2*x)+3*(cos(2*x))')*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*(cos(2*x))')*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*-sin(2*x)*(2*x)')*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*-sin(2*x)*((2)'*x+2*(x)'))*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*-sin(2*x)*(0*x+2*(x)'))*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*-sin(2*x)*(0*x+2*1))*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*2*(-sin(2*x)))*3-(3*cos(2*x)*(3)'))/(3^2)
((0*cos(2*x)+3*-2*sin(2*x))*3-(3*cos(2*x)*(3)'))/(3^2)
(-6*sin(2*x)*3-(3*cos(2*x)*(3)'))/(3^2)
(-6*sin(2*x)*3-(3*cos(2*x)*0))/(3^2)
-2*sin(2*x)
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