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January 31, 2015

January 31, 2015

Posted by **Help needed!** on Friday, June 3, 2011 at 12:04am.

2-2cos^2=sinx+1

- Trigonometry -
**Reiny**, Friday, June 3, 2011 at 7:07am2 - 2(1-sin^2x) - sinx - 1 = 0

2sin^2x - sinx -1 = 0

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

sinx = -1/2 or sinx = 1

x = 210° or 330° or 90°

or

x = 7π/6 , 11π/6, or π/2

- Trigonometry -
**sunny**, Wednesday, August 8, 2012 at 2:43pmjkjkkllklkgjsin cos

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