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.

The exact value of is .

Multiply by .

Find the Exact Value sin(-90)

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# Find the Exact Value 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.

The exact value of is .

Multiply by .

Find the Exact Value sin(-90)