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The value of cos y cos ((pi)/(2) - x) - ...

The value of cos y cos `((pi)/(2) - x) - cos ((pi)/(2) - y) cos x + sin y cos ((pi)/(2) - x) + cos x sin ((pi)/(2) - y)` is zero if

A

`x=0`

B

`y=0`

C

`x=y`

D

`npi+y-(pi)/4(n in Z)`

Text Solution

Verified by Experts

The correct Answer is:
D
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