Question 5Suppose that $\sin x=\frac{12}{13}$ and $\cos y=-\frac45$, where $0^\circ\le x\le90^\circ$ and $90^\circ\le y\le180^\circ$. Find the value of $\cos(x+y)$.$-\frac{56}{65}$$\frac{56}{65}$$-\frac{16}{65}$$\frac{16}{65}$None of the above