Trigonometry Examples

$\sin (- \frac{π}{5})$

Step 1

Add full rotations of $2 π$ until the angle is greater than or equal to $0$ and less than $2 π$ .

$\sin (\frac{9 π}{5})$

Step 2

The result can be shown in multiple forms.

Exact Form:

$\sin (\frac{9 π}{5})$

Decimal Form:

$- 0.58778525 \dots$