Precalculus Examples

$\sin (2 π) + \cos (2 π)$

Step 1

Simplify each term.

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Step 1.1

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

$\sin (0) + \cos (2 π)$

Step 1.2

The exact value of $\sin (0)$ is $0$ .

$0 + \cos (2 π)$

Step 1.3

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

$0 + \cos (0)$

Step 1.4

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

$0 + 1$

Step 2

Add $0$ and $1$ .

$1$