If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y=2\pi ,\]then \[{{\sin }^{-1}}x+{{\sin }^{-1}}y\]is equal to

If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y=2\pi ,\]then \[{{\sin }^{-1}}x+{{

1.	If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y=2\pi ,\]then \[{{\sin }^{-1}}x+{{\sin }^{-1}}y\]is equal to
A.	\[\pi \]
B.	\[-\pi \]
C.	\[\frac{\pi }{2}\]
D.	None of these
Answer» C. \[\frac{\pi }{2}\]

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If \[{{\cos }^{-1}}x+{{\cos }^{-1}}y=2\pi ,\]then \[{{\sin }^{-1}}x+{{\sin }^{-1}}y\]is equal to

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