Trigonometry Examples

$\cos (\frac{π}{5}) \cdot (\cos (\frac{2 π}{5}) \cos (\frac{4 π}{5}) \cos (\frac{8 π}{5}))$

Step 1

Remove parentheses.

$\cos (\frac{π}{5}) \cos (\frac{2 π}{5}) \cos (\frac{4 π}{5}) \cos (\frac{8 π}{5})$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{π}{5}) \cos (\frac{2 π}{5}) \cos (\frac{4 π}{5}) \cos (\frac{8 π}{5})$

Decimal Form:

$- 0.0624\overline{9}$