Trigonometry Examples

$\cos (\frac{π}{16}) \cos (\frac{3 π}{16}) - \sin (\frac{π}{16}) \sin (\frac{3 π}{16})$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{π}{16}) \cos (\frac{3 π}{16}) - \sin (\frac{π}{16}) \sin (\frac{3 π}{16})$

Decimal Form:

$0.70710678 \dots$