CPM Homework Help : PC3 Problem 8-123

Verify the following trigonometric identity: $\cos\left(y\right)+\sin\left(y\right)·\tan\left(y\right)=$ $\sec\left(y\right)$

Hint:

Rewrite $\tan\left(y\right)$ as $\frac{\sin\left(y\right)}{ \cos\left(y\right)}$ .
Get common denominators and simplify.