dovananhhao3112 dovananhhao3112
  • 15-10-2021
  • Mathematics
contestada

cos2x + cosx + 1=0
lam on dum

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leylahassan73
leylahassan73 leylahassan73
  • 15-10-2021

Step-by-step 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
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