Se $\frac{\cos x}{\cos y}+\frac{\mathrm{sen}x}{\mathrm{sen}y}=-1$, calcule o valor $S$.$$S=\frac{3\cos y+\cos 3y}{\cos x}+\frac{3\mathrm{sen}y-\mathrm{sen}3y}{\mathrm{sen}x}$$