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