The expression ${{\tan {\rm A}} \over {1 - \cot {\rm A}}} + {{\cot {\rm A}} \over {1 - \tan {\rm A}}}$ can be written as:

Question

$\sin {\rm A}\,\cos {\rm A} + 1$

$\,\sec {\rm A}\,\cos ec{\rm A} + 1$

$\tan {\rm A} + \cot {\rm A}$

$\sec {\rm A} + \cos ec{\rm A}$

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