sumformlene
Posted: 24/11-2015 21:01
2sin^2x+cosx=1
[tex]2sin^2x+cosx=1[/tex]Gjest wrote:2sin^2x+cosx=1
[tex](sin^2x=1-Cos^2x)[/tex]
[tex]2(1-cos^2x)+cos(x)-1=0[/tex]
[tex]-2cos^2(x)+cos(x)-1+2[/tex]
[tex]-2cos^2(x)+cos(x)+1=0[/tex]
Sett [tex]u=cos(x)[/tex]
Resten klarer du selv?