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(x-(15*cos(x)))'The calculation above is a derivative of the function f (x)
(-(15*cos(x)))'+(x)'
(15)'*cos(x)+15*(cos(x))'+(x)'
0*cos(x)+15*(cos(x))'+(x)'
0*cos(x)+15*(-sin(x))+(x)'
15*sin(x)+1
15*sin(x)+1
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