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