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(Sen A / Cos A + 1/ Cos A) ( Sen A/ Cos A - 1/ Cos A)
(Sen A + 1 / Cos A)(Sen A-1/ Cos A)
Sen^2 A - Sen A + Sen A - 1/ Cos^2 A)
Sen^2-1/ Cos^2 A
1-Cos A ^2 - 1 / Cos^ 2 A
-Cos^2A / Cos^2 A
-1