Precalculus Examples

$\cos (- 270)$

Step 1

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

Step 2

Evaluate $\cos (- 270)$ .

$0 \cdot \frac{π}{180}$ radians

Step 3

Multiply $0 \frac{π}{180}$ .

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Step 3.1

Combine $0$ and $\frac{π}{180}$ .

$\frac{0 π}{180}$ radians

Step 3.2

Multiply $0$ by $π$ .

$\frac{0}{180}$ radians

Step 4

Divide $0$ by $180$ .

$0$ radians