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