The value of \[\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left( \frac{\pi }{2}-y \right)\cos x\] \[+\sin y\cos \left( \frac{\pi }{2}-x \right)+\cos x\sin \left( \frac{\pi }{2}-y \right)\] is zero, if

\[x=n\pi -\frac{\pi }{4}+y,\,\,(n\in I)\]

The value of \[\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left(

1.	The value of \[\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left( \frac{\pi }{2}-y \right)\cos x\] \[+\sin y\cos \left( \frac{\pi }{2}-x \right)+\cos x\sin \left( \frac{\pi }{2}-y \right)\] is zero, if
A.	\[x=0\]
B.	\[y=0\]
C.	\[x=y\]
D.	\[x=n\pi -\frac{\pi }{4}+y,\,\,(n\in I)\]
Answer» E.

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The value of \[\cos y\cos \left( \frac{\pi }{2}-x \right)-\cos \left( \frac{\pi }{2}-y \right)\cos x\] \[+\sin y\cos \left( \frac{\pi }{2}-x \right)+\cos x\sin \left( \frac{\pi }{2}-y \right)\] is zero, if

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