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

(cos(x))'*sin(2*x)+cos(x)*(sin(2*x))'

cos(x)*(sin(2*x))'-sin(x)*sin(2*x)

cos(x)*cos(2*x)*(2*x)'-sin(x)*sin(2*x)

cos(x)*cos(2*x)*((2)'*x+2*(x)')-sin(x)*sin(2*x)

cos(x)*cos(2*x)*(0*x+2*(x)')-sin(x)*sin(2*x)

cos(x)*cos(2*x)*(0*x+2*1)-sin(x)*sin(2*x)

cos(x)*2*cos(2*x)-sin(x)*sin(2*x)

2*cos(x)*cos(2*x)-(sin(x)*sin(2*x))

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