Precalculus Examples

$\cos (\frac{7}{3} \cdot π)$

Step 1

Combine $\frac{7}{3}$ and $π$ .

$\cos (\frac{7 π}{3})$

Step 2

Subtract full rotations of $2 π$ until the angle is greater than or equal to $0$ and less than $2 π$ .

$\cos (\frac{π}{3})$

Step 3

The exact value of $\cos (\frac{π}{3})$ is $\frac{1}{2}$ .

$\frac{1}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2}$

Decimal Form:

$0.5$