# Trig - Factoring

• November 23rd 2009, 07:15 PM
maryanna91
Trig - Factoring
I've been working on a problem and Im stuck here:

2(cos(x))^2 + sin(x) - 1 = 0

I just can't figure out how to factor this any further, any help would be appreciated :)
• November 23rd 2009, 07:22 PM
skeeter
Quote:

Originally Posted by maryanna91
I've been working on a problem and Im stuck here:

2(cos(x))^2 + sin(x) - 1 = 0

I just can't figure out how to factor this any further, any help would be appreciated :)

$2(1 - \sin^2{x}) + \sin{x} - 1 = 0$

$2 - 2\sin^2{x} + \sin{x} - 1 = 0$

$1 + \sin{x} - 2\sin^2{x} = 0$

factor and finish ...
• November 23rd 2009, 07:24 PM
maryanna91
Thanks a lot!