differentiation

Question: $\frac{d}{{dx}}\left( {\frac{{\sec x + \tan x}}{{\sec x - \tan x}}} \right) = $

1) $\frac{{2\cos x}}{{{{(1 - \sin x)}^2}}}$

2) $\frac{{\cos x}}{{{{(1 - \sin x)}^2}}}$

3) $\frac{{2\cos x}}{{1 - \sin x}}$

4) None of these

Solution:

Explanation: Explanation

standard-differentiation

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