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