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April 24, 2014

Homework Help: precalculus half angle question stumped

Posted by george on Monday, January 11, 2010 at 1:01am.

Given tanu= -1/3 and sinu <0, find sin(u/2)
if 0 is less than or equal to u < 2 pie

I think its a right triangle in fourth quadrant with the point (3,-1) (hypotenuse equals square root of ten) but I'm brain dead and can't find u or any solutions.

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