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