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(3*tan(5*x))'The calculation above is a derivative of the function f (x)
(3)'*tan(5*x)+3*(tan(5*x))'
0*tan(5*x)+3*(tan(5*x))'
0*tan(5*x)+3*((5*x)'/((cos(5*x))^2))
0*tan(5*x)+3*(((5)'*x+5*(x)')/((cos(5*x))^2))
0*tan(5*x)+3*((0*x+5*(x)')/((cos(5*x))^2))
0*tan(5*x)+3*((0*x+5*1)/((cos(5*x))^2))
0*tan(5*x)+3*(5/((cos(5*x))^2))
15/((cos(5*x))^2)
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