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January 28, 2015

January 28, 2015

Posted by **Tabitha** on Thursday, January 20, 2011 at 3:34pm.

- Trig -
**helper**, Thursday, January 20, 2011 at 6:57pmcos^2 x = 1

take square root of both sides

+- cos x = 1

cos x = 1

cos x = -1

for what angle value is cos = 1 and cos = -1 ?

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