Precalculus Examples

$3 \sin (\frac{3 π}{2})$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the fourth quadrant.

$3 (- \sin (\frac{π}{2}))$

Step 2

The exact value of $\sin (\frac{π}{2})$ is $1$ .

$3 (- 1 \cdot 1)$

Step 3

Multiply $3 (- 1 \cdot 1)$ .

Tap for more steps...

Step 3.1

Multiply $- 1$ by $1$ .

$3 \cdot - 1$

Step 3.2

Multiply $3$ by $- 1$ .

$- 3$