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(tan(9*x))'The calculation above is a derivative of the function f (x)
(9*x)'/((cos(9*x))^2)
((9)'*x+9*(x)')/((cos(9*x))^2)
(0*x+9*(x)')/((cos(9*x))^2)
(0*x+9*1)/((cos(9*x))^2)
9/((cos(9*x))^2)
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