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April 18, 2015

April 18, 2015

Posted by **Tina** on Monday, April 12, 2010 at 11:18pm.

- Trig -
**Reiny**, Tuesday, April 13, 2010 at 12:22amsin^2x+2cosx=2

1 - cos^2x + 2cosx - 2 = 0

cos^2x - 2cosx + 1 = 0

(cosx - 1)^2 = 0

.

.

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cosx = 1

Can you take it from there?

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