Solution of differential equation in Trigonometric functions of $x$ and $y$ If $$\frac{dy}{dx} +\frac{\cos x(3\cos y-7\sin x-3)}{\sin y(3\sin x-7\cos y+7)}=0$$
Attempt: $(3\sin x\sin y-7\cos y \sin y+7\sin y)dy+(3\cos x\cos y-7\sin x\cos -3\cos x)dx =0$
could some help me how to solve it , thanks

Hint
Let $a=\sin x$ and $b=\sin y$, then substitute it in the original equation. For $\cos x$ use $\pm\sqrt{1-a^2}$ and similarly for $b$.
