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(tan(4*x))'The calculation above is a derivative of the function f (x)
(4*x)'/((cos(4*x))^2)
((4)'*x+4*(x)')/((cos(4*x))^2)
(0*x+4*(x)')/((cos(4*x))^2)
(0*x+4*1)/((cos(4*x))^2)
4/((cos(4*x))^2)
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