dovananhhao3112
dovananhhao3112
15-10-2021
Mathematics
contestada
cos2x + cosx + 1=0
lam on dum
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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
now solve for y and then solve for y=cosx
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