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January 25, 2015

January 25, 2015

Posted by **Argelia** on Wednesday, February 13, 2013 at 12:44am.

2cos^2x-5sinx+1=0

- pre-cal -
**Steve**, Wednesday, February 13, 2013 at 1:12pm2(1-sin^2)-5sin+1=0

2sin^2 + 5sin - 3 = 0

(2sin-1)(sin+3) = 0

so, sinx = 1/2 or -3

-3 is not allowed, so

sinx = 1/2: x = pi/6 or 5pi/6

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