### Home > PC3 > Chapter 9 > Lesson 9.1.1 > Problem9-9

9-9.

Prove that $\frac{ \sec ( x ) \tan ( x ) } {\sin ( x ) } = \sec^2(x)$ .

Rewrite the expression on the left using only sine and cosine.

$\frac{\frac{1}{\cos x}\cdot\frac{\sin(x)}{\cos(x)}}{\sin(x)}$