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(tan(-5*x))'The calculation above is a derivative of the function f (x)
(-5*x)'/((cos(-5*x))^2)
((-5)'*x-5*(x)')/((cos(-5*x))^2)
(0*x-5*(x)')/((cos(-5*x))^2)
(0*x-5*1)/((cos(-5*x))^2)
-5/((cos(-5*x))^2)
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