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Trig Help?

spwath
By spwath
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IM stuck on one, problem, I cant figure outhow to start...

 

Solve over [0,2pi)

Cos2x+cosx=0

 

 

I got to cos²x+cosx-sin²x=0 but im not sure if I can do anything from there

n0ah1897, on 05 Mar 2014 - 2:08 PM, said:  "Computers are like girls. It's whats in the inside that matters.  I don't know about you, but I like my girls like I like my cases. Just as beautiful on the inside as the outside."

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