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December 21, 2014

December 21, 2014

Posted by **Lucy** on Saturday, April 19, 2008 at 4:17pm.

2)Find the solution of sin 2theta = cos theta if 0 degrees</= theta < 180 degrees.

I have read the book and looked at the examples, but cannot figure out how to work these. Any help would be great!!

Thanks

- Algebra II -
**Damon**, Saturday, April 19, 2008 at 7:09pm1)

105 * 2 = 210 is a nice angle, 180 + 30

2)

2 sin t cos t = cos t

2 sin t = 1

sin t = 1/2

t = 30 degrees or pi/6 radians

the other solution t = 150 degrees is no good because the cos t would be negative

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