Derivative of ' \( y \) ' if \( y=\frac{1}{\sec x-\tan x} \)....

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Derivative of ' \( y \) ' if \( y=\frac{1}{\sec x-\tan x} \)
\( \mathrm{P} \)
W
(1) \( \frac{\sec x}{\sec x-\tan x} \)
(2) \( \frac{\sec x}{\sec x+\tan x} \)
(3) \( \sec ^{2} x+\tan x \)
(4) None of these


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