Precalculus Examples

$1 + \cos (60)$

Step 1

The exact value of $\cos (60)$ is $\frac{1}{2}$ .

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

Step 2

Write $1$ as a fraction with a common denominator.

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

Step 3

Combine the numerators over the common denominator.

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

Step 4

Add $2$ and $1$ .

$\frac{3}{2}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$\frac{3}{2}$

Decimal Form:

$1.5$

Mixed Number Form:

$1 \frac{1}{2}$