If (sinx)(cosy)=1/2,t h e n(d^2y)/(dx^2)...

If `(sinx)(cosy)=1/2,t h e n(d^2y)/(dx^2)a t(pi/4,pi/4)` is `-4` (b) `-2` (c) `-6` (d) `0`

A

`-4`

B

`-2`

C

`-6`

D

0

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A

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