Trigonometry Examples

$2 π$

Step 1

Take the cosine of $2 π$ .

$\cos (2 π)$

Step 2

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

$\cos (0)$

Step 3

The exact value of $\cos (0)$ is $1$ .

$1$