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(tan(8/x))'The calculation above is a derivative of the function f (x)
(8/x)'/((cos(8/x))^2)
(((8)'*x-(8*(x)'))/(x^2))/((cos(8/x))^2)
((0*x-(8*(x)'))/(x^2))/((cos(8/x))^2)
((0*x-(8*1))/(x^2))/((cos(8/x))^2)
(-8/(x^2))/((cos(8/x))^2)
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