JEE Math Practice Question
If $$y = \sec \left( {{{\tan }^{ - 1}}x} \right),$$ then $${{{dy} \over {dx}}}$$ at $$x=1$$ is equal to :
- A.$${1 \over {\sqrt 2 }}$$
- B.$${1 \over 2}$$
- C.$$1$$
- D.$$\sqrt 2 $$
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