If 3 sin (xy) + 4 cos (xy) = 5 , " then...

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

A

`-y/x`

B

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

C

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

D

None of these

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The correct Answer is:

A

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