Trigonometry Examples

$\cos (11) \cos (19) - \sin (11) \sin (19)$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\cos (11) \cos (19) - \sin (11) \sin (19)$

Decimal Form:

$0.86602540 \dots$

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