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Cos2x + cosx + 1=0 lam on dum
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3 votes
Cos2x + cosx + 1=0
lam on dum

User Raj Tamakuwala
by
3.6k points

1 Answer

6 votes

Explanation:

cos(2x)+cos(x)+1=0{2cos^2(x)-1}+cos(x)+1=0

let cos x=y

2y^2+y+1=0

  1. now solve for y and then solve for y=cosx
User Sleiman
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