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January 31, 2015

January 31, 2015

Posted by **Jeff** on Thursday, January 20, 2011 at 11:41pm.

- math (trig) -
**drwls**, Friday, January 21, 2011 at 11:45am-1/3 = cos 2theta = 1 - 2 sin^2 theta

2 sin^2 theta = 4/3

sin theta = sqrt(2/3)

cos theta = sqrt(1 - 2/3) = -sqrt(1/3)

(minus since theta must be in quadrant 2)

tan theta = -sqrt2

theta = 125.26 degrees

You draw the figure

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