Trigonometry Examples

$\cos (57) \cos (78) - \sin (57) \sin (78)$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\cos (57) \cos (78) - \sin (57) \sin (78)$

Decimal Form:

$- 0.70710678 \dots$

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