Precalculus Examples

$\cos (20) \cos (40) - \sin (20) \sin (40)$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\cos (20) \cos (40) - \sin (20) \sin (40)$

Decimal Form:

$0.5$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$