Trigonometry Examples

$2 \sin (270)$

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 third quadrant.

$2 (- \sin (90))$

Step 2

The exact value of $\sin (90)$ is $1$ .

$2 (- 1 \cdot 1)$

Step 3

Multiply $2 (- 1 \cdot 1)$ .

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Step 3.1

Multiply $- 1$ by $1$ .

$2 \cdot - 1$

Step 3.2

Multiply $2$ by $- 1$ .

$- 2$