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