A) \[\sin ({{\cos }^{-1}}x)=\cos ({{\sin }^{-1}}x)\]
B) \[\sec ({{\tan }^{-1}}x)=\tan ({{\sec }^{-1}}x)\]
C) \[\cos ({{\tan }^{-1}}x)=\tan ({{\cos }^{-1}}x)\]
D) \[\tan ({{\sin }^{-1}}x)=\sin ({{\tan }^{-1}}x)\]
E) all of these
Correct Answer: A
Solution :
It is clear that only option (a) is true.
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