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