(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

-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?

2. Relevant equations

3. 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?

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# Homework Help: Trig question -sin pi/4 , give the exact value?

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