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