Algebra 2 Common Core

$$1$$
Use the Tangent Identity $$\tan\theta=\frac{\sin\theta}{\cos\theta}$$ to obtain $$\frac{\sin\theta}{\cos\theta\tan\theta}=\bigg(\frac{\sin\theta}{\cos\theta}\bigg)\bigg(\frac{1}{\tan\theta}\bigg)=\tan\theta\bigg(\frac{1}{\tan\theta}\bigg)=1.$$