Trigonometry Examples

$\cos (2 \arccos (\frac{4}{7}))$

Step 1

Evaluate $\arccos (\frac{4}{7})$ .

$\cos (2 \cdot 0.96255074)$

Step 2

Multiply $2$ by $0.96255074$ .

$\cos (1.92510149)$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (2 \arccos (\frac{4}{7}))$

Decimal Form:

$- 0.34693877 \dots$

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