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

If `3sin(x y)+4cos(x y)=5` , then `(dy)/(dx)=`
(a)` y/x`
(b) `(3sin(x y)+4cos(x y))/(3cos(x y)-4sin(x y))`
(c) `(3cos(x y)+4sin(x y))/(4cos(x y)-3sin(x y))`
(d) none

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