Need help on this part

http://i.imgur.com/9U4Fh.jpg

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- Jul 21st 2010, 11:55 AMstiitchesHelp with a problem
Need help on this part

http://i.imgur.com/9U4Fh.jpg - Jul 21st 2010, 12:04 PMHallsofIvy
The sine is the y coordinate of the point at which the line y= -2x and the unit circle, $\displaystyle x^2+ y^2= 1$ intersect. What is that point? (Of course, the line and circle intersect in

**two**points. You want the one in the second quadrant.)