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December 19, 2014

December 19, 2014

Posted by **Katie** on Monday, June 9, 2008 at 5:58pm.

- trig -
**drwls**, Monday, June 9, 2008 at 6:41pmCall sin a new variable y and solve the quadratic equation for y:

2y^2 +y -1 = 0

(2y - 1) (y + 1) = 0

y = sin x = -1/2 or -1

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