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Neopets

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## Homework Statement

-sin pi/4 , give the exact value?

-1/root 2 is the answer according to the book? How in the world do they get that result. What do you to make that happen?

## Homework Equations

## The Attempt at a Solution

Also, is this how to do the problem? Find pi/4 on the unit circle, it's root 2 / 2, that doesn't seem to get the right answer even though that's was supposed to be the method?