Trigonometry Examples

$2 \sin (\frac{2 π}{9}) \cos (\frac{2 π}{9})$

Step 1

Apply the sine double-angle identity.

$\sin (2 \frac{2 π}{9})$

Step 2

Multiply

$2 \frac{2 π}{9}$ .

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Step 2.1

Combine

$2$ and

$\frac{2 π}{9}$ .

$\sin (\frac{2 (2 π)}{9})$

Step 2.2

Multiply

$2$ by

$2$ .

$\sin (\frac{4 π}{9})$

$\sin (\frac{4 π}{9})$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\sin (\frac{4 π}{9})$

Decimal Form:

$0.98480775 \dots$

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