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February 28, 2015

February 28, 2015

Posted by **Anonymous** on Thursday, September 29, 2011 at 6:22pm.

- trig -
**Huurdurrdedooba**, Thursday, September 29, 2011 at 7:16pmlets set theta = x

cos x + 1 = 0

lets solve for x

cos x = -1

x = arccos -1 arccos is inverse of cos.

Now what values would make cos -1?

Answer: 180 degrees.

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