Trigonometry Examples

$\cos (2 \arctan (\frac{15}{8}))$

Step 1

Evaluate $\arctan (\frac{15}{8})$ .

$\cos (2 \cdot 1.080839)$

Step 2

Multiply $2$ by $1.080839$ .

$\cos (2.161678)$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (2 \arctan (\frac{15}{8}))$

Decimal Form:

$- 0.55709342 \dots$

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