Precalculus Examples

$\cos (2 (\frac{8 π}{2}))$

Step 1

Cancel the common factor of $2$ .

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Step 1.1

Cancel the common factor.

$\cos (2 \frac{8 π}{2})$

Step 1.2

Rewrite the expression.

$\cos (8 π)$

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 $1$ .

$1$