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(2*tan(3*x))'The calculation above is a derivative of the function f (x)
(2)'*tan(3*x)+2*(tan(3*x))'
0*tan(3*x)+2*(tan(3*x))'
0*tan(3*x)+2*((3*x)'/((cos(3*x))^2))
0*tan(3*x)+2*(((3)'*x+3*(x)')/((cos(3*x))^2))
0*tan(3*x)+2*((0*x+3*(x)')/((cos(3*x))^2))
0*tan(3*x)+2*((0*x+3*1)/((cos(3*x))^2))
0*tan(3*x)+2*(3/((cos(3*x))^2))
6/((cos(3*x))^2)
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