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If 3sin(xy)+4cos(xy)=5, then dy/dx=...

If `3sin(xy)+4cos(xy)=5`, then `dy/dx=`

A

`-y/x`

B

`(3sin(xy)+4cos(xy))/(3cos(xy)-4sin(xy))`

C

`(3cos(xy)+4sin(xy))/(3cos(xy)-4sin(xy))`

D

`y/x`.

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