The roots of the equation 7x2 - 6x + 1 = 0 are tan α and tan β, where 2α and 2β are the angles of a triangle. Which one of the following is correct?
1
The triangle is equilateral
2
The triangle is isosceles but not right-angled
3
The triangle is right-angled
4
The triangle is right-angled isosceles