1. The problem is to simplify the expression $\frac{\sin(x)}{\cos(x)}$. 2. Recall the trigonometric identity: $\tan(x) = \frac{\sin(x)}{\cos(x)}$. 3. Using this identity, we can rewrite the expression as $\tan(x)$. 4. Therefore, the simplified form of $\frac{\sin(x)}{\cos(x)}$ is $\tan(x)$.