How do you find the exact value of #sin(-90)#?

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Mar 7, 2018

Answer:

#sin (-90) = -1#

Explanation:

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#sin -90 = sin (360 - 90) = sin 270#

Angle #270^@# is third quadrant, where only tan and cot are positive.

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Hence #sin 270 = sin (180 + 90) = - sin 90 = -1#

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