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September 20, 2014

Homework Help: trig

Posted by Sandy on Wednesday, March 10, 2010 at 5:05pm.

I don't understand how to do this type of question? If 9cos^2 theta +3cos theta=0, where 90 degrees <theta<180 degrees, what is the value of theta, correct to the nearest tenth of a degree. Could someone please explain. Thanks

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