Precalculus Examples

$\sin (30) + \cos (45)$

Step 1

The exact value of $\sin (30)$ is $\frac{1}{2}$ .

$\frac{1}{2} + \cos (45)$

Step 2

The exact value of $\cos (45)$ is $\frac{\sqrt{2}}{2}$ .

$\frac{1}{2} + \frac{\sqrt{2}}{2}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2} + \frac{\sqrt{2}}{2}$

Decimal Form:

$1.20710678 \dots$