If: $$\frac{\cos x}{\cos y}=\frac{1}{2}$$ and $$\frac{\sin x}{\sin y}=3$$
How to find $$\frac{\sin 2x}{\sin 2y}+\frac{\cos 2x}{\cos 2y}$$
If: $$\frac{\cos x}{\cos y}=\frac{1}{2}$$ and $$\frac{\sin x}{\sin y}=3$$
How to find $$\frac{\sin 2x}{\sin 2y}+\frac{\cos 2x}{\cos 2y}$$