If (sin x)(cos y)=1//2 then d^(2)y//dx^(...

If `(sin x)(cos y)=1//2` then `d^(2)y//dx^(2)` at `(pi//4,pi//4)` is equal to

A

`-4`

B

`-2`

C

`-6`

D

0

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Verified by Experts

The correct Answer is:

A

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