`sin^-1 (-sqrt(2)/2)` Evaluate the expression without using a calculator.

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Chapter 4, 4.7 - Problem 12 - Precalculus (3rd Edition, Ron Larson).
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loves2learn | (Level 3) Salutatorian

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This asks you what value of sin equals `-sqrt2/2 ` (`sinx=-sqrt2/2 ` . Remember that sin is y values . Using a unit circle, you can determine that the answer is `-pi/4 ` .

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