Precalculus Examples

$\cot (- 180 °)$

Step 1

Find the value using the definition of cotangent.

$\cot (- 180 °) = \frac{adjacent}{opposite}$

Step 2

Substitute the values into the definition.

$\cot (- 180 °) = \frac{- 1}{0}$

Step 3

The value of a trigonometric function is undefined when the expression of its value ( $\frac{- 1}{0}$ ) is an undefined quantity because of division by $0$ .

Undefined