# Help with a problem

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• Jul 21st 2010, 11:55 AM
stiitches
Help with a problem
Need help on this part

http://i.imgur.com/9U4Fh.jpg
• Jul 21st 2010, 12:04 PM
HallsofIvy
The sine is the y coordinate of the point at which the line y= -2x and the unit circle, $x^2+ y^2= 1$ intersect. What is that point? (Of course, the line and circle intersect in two points. You want the one in the second quadrant.)