Precalculus Examples

$\cos (8.1)$

Step 1

To convert degrees to radians, multiply by $\frac{π}{180 °}$ , since a full circle is $360 °$ or $2 π$ radians.

Step 2

Combine $\cos (8.1)$ and $\frac{π}{180}$ .

$\frac{\cos (8.1) π}{180}$ radians

Step 3

Evaluate $\cos (8.1)$ .

$\frac{- 0.24354415 π}{180}$ radians

Step 4

Multiply $- 0.24354415$ by $π$ .

$\frac{- 0.76511652}{180}$ radians

Step 5

Divide $- 0.76511652$ by $180$ .

$- 0.00425064$ radians