Trigonometry Examples

$\cos (- 2 π)$

Find the value using the definition of cosine.

$\cos (- 2 π) = \frac{adjacent}{hypotenuse}$

Substitute the values into the definition.

$\cos (- 2 π) = \frac{1}{1}$

Divide $1$ by $1$ .

$1$

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