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September 2, 2014

September 2, 2014

Posted by **stellar** on Friday, September 30, 2011 at 12:46pm.

cos θ = 1/7

- trig -
**Steve**, Friday, September 30, 2011 at 12:56pmcosine is positive in QI and QIV

Find θ such that cos θ = 1/7

It is the only angle between 0° and 180° whichc has such a positive cosine value.

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