Trigonometry Examples

$\sin (\frac{2 π}{7}) \cos (\frac{π}{21}) + \cos (\frac{2 π}{7}) \sin (\frac{π}{21})$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\sin (\frac{2 π}{7}) \cos (\frac{π}{21}) + \cos (\frac{2 π}{7}) \sin (\frac{π}{21})$

Decimal Form:

$0.86602540 \dots$