Trig - Factoring

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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!

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