Answer these if u can I don't get it

Use a graphing utility to approximate the solutions of the following equations in the interval shown:

1. [tex]x tan x-1=0[/tex] ; [tex][0,2\pi )[/tex]
2. [tex]6sin^{2} x-7sinx+2=0[/tex] ; [tex][0,2\pi )[/tex]
3. [tex]cos^{2} x-2cosx-1=0[/tex] ; [tex][0,\pi ][/tex]