Q. If $3 s in (x y) + 4 cos (x y) = 5, t h e n \frac{d y}{d x} =$

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A

$- \frac{y}{x}$

100%

B

$\frac{3 s in ( x y ) + 4 cos ( x y )}{3 cos ( x y ) - 4 s in ( x y )}$

0%

C

$\frac{3 cos ( x y ) + 4 s in ( x y )}{4 cos ( x y ) - 3 s in ( x y )}$

0%

D

none of these.

0%

Solution:

Correct answer is (a) $- \frac{y}{x}$