Precalculus Examples

$\cos (180)$

Step 1

Find the value using the definition of cosine.

$\cos (180) = \frac{adjacent}{hypotenuse}$

Step 2

Substitute the values into the definition.

$\cos (180) = \frac{- 1}{1}$

Step 3

Divide $- 1$ by $1$ .

$- 1$

Step 4

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$