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