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