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January 26, 2015

January 26, 2015

Posted by **Miranda** on Thursday, August 12, 2010 at 10:13pm.

3cos2x - 5cosx = 1

- trig -
**drwls**, Thursday, August 12, 2010 at 10:32pmUse cos2x = 2 cos^2x -1 and convert the equation to a second order polynomial in which cosx is the variable. There should be two possible values of cosx.

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