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(-(6*x^2*sin(x)))'The calculation above is a derivative of the function f (x)
(6*x^2)'*sin(x)+6*x^2*(sin(x))'
((6)'*x^2+6*(x^2)')*sin(x)+6*x^2*(sin(x))'
(0*x^2+6*(x^2)')*sin(x)+6*x^2*(sin(x))'
(0*x^2+6*2*x^(2-1))*sin(x)+6*x^2*(sin(x))'
(0*x^2+6*2*x)*sin(x)+6*x^2*(sin(x))'
12*x*sin(x)+6*x^2*(sin(x))'
12*x*sin(x)+6*x^2*cos(x)
-(12*x*sin(x)+6*x^2*cos(x))
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