Trigonometry Examples

$\cos (- \frac{3}{2} \cdot π)$

Step 1

Combine $π$ and $\frac{3}{2}$ .

$\cos (- \frac{π \cdot 3}{2})$

Step 2

Move $3$ to the left of $π$ .

$\cos (- \frac{3 \cdot π}{2})$

Step 3

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

$\cos (\frac{π}{2})$

Step 4

The exact value of $\cos (\frac{π}{2})$ is $0$ .

$0$