Givent that pi/2 lt alphaltpi then the e...

Givent that `pi/2 lt alphaltpi` then the expression `sqrt((1-sinalpha)/(1+sinalpha))+sqrt((1+sinalpha)/(1-sinalpha))` (A) `1/(cosalpha)` (B) `- 2/(cosalpha)` (C) `2/(cosalpha)` (D) does not exist

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