A) \[\frac{1}{2}\sqrt{\frac{1-\tan x}{1+\tan x}}{{\sec }^{2}}\left( \frac{\pi }{4}+x \right)\]
B) \[\sqrt{\frac{1-\tan x}{1+\tan x}}{{\sec }^{2}}\left( \frac{\pi }{4}+x \right)\]
C) \[\frac{1}{2}\sqrt{\frac{1-\tan x}{1+\tan x}}\sec \left( \frac{\pi }{4}+x \right)\]
D) All of these
E) None of these
Correct Answer: A
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