Precalculus Examples

$\cot (20) - \frac{\cos (20)}{\sin (20)}$

Step 1

Rewrite $\cot (20)$ in terms of sines and cosines.

$\frac{\cos (20)}{\sin (20)} - \frac{\cos (20)}{\sin (20)}$

Step 2

Combine the numerators over the common denominator.

$\frac{\cos (20) - \cos (20)}{\sin (20)}$

Step 3

Subtract $\cos (20)$ from $\cos (20)$ .

$\frac{0}{\sin (20)}$

Step 4

Divide $0$ by $\sin (20)$ .

$0$