Find the Exact Value sin(-90)

$\sin (- 90)$

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.

$- \sin (90)$

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

$- 1 \cdot 1$

Multiply $- 1$ by $1$ .

$- 1$

Find the Exact Value sin(-90)

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