What is the value of:\[\cos \left[ {{\tan }^{-1}}\left\{ \tan \left( \frac{15\pi }{4} \right) \right\} \right]?\]

What is the value of:\[\cos \left[ {{\tan }^{-1}}\left\{ \tan \left( \

1.	What is the value of:\[\cos \left[ {{\tan }^{-1}}\left\{ \tan \left( \frac{15\pi }{4} \right) \right\} \right]?\]
A.	\[-\frac{1}{\sqrt{2}}\]
B.	0
C.	\[\frac{1}{\sqrt{2}}\]
D.	\[\frac{1}{2\sqrt{2}}\]
Answer» D. \[\frac{1}{2\sqrt{2}}\]

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What is the value of:\[\cos \left[ {{\tan }^{-1}}\left\{ \tan \left( \frac{15\pi }{4} \right) \right\} \right]?\]

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