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