## Trigonometry (10th Edition)

$\tan\theta$
Multiply Sin by 1 over Cos $\sin\theta\times\frac{1}{\cos\theta}$ =$\frac{\sin\theta}{1}\times\frac{1}{\cos\theta}$ Any expression Multiplied by 1 remains the same = $\frac{\sin\theta}{\cos\theta}$ =$\tan\theta$