I don't even know where to start with this question! I know the Compound formulas, but I do not know how to apply them to this question.

Question:

If x and y are in the interval $\displaystyle (0, \frac{\pi}{2}) $ and sinx = $\displaystyle \frac{3}{5} $ and cosy = $\displaystyle \frac{12}{13} $ evaluate each of the following.

a) $\displaystyle \sin (x + y) $

What I know:

I know that $\displaystyle sin (a + b) = sina * cosb + cosa * sinb $

Any help is greatly appreciated!

Edit:This question is solved.