Known hyperbola x ^ 2 / A ^ 2-y ^ 2 / b ^ 2 = 1 (a > 0b)

Known hyperbola x ^ 2 / A ^ 2-y ^ 2 / b ^ 2 = 1 (a > 0b)

If there is only one intersection point between the straight line passing through the right focus F and the [right branch] with an inclination angle of 60 degrees, then:
The slope of asymptote y = (B / a) x B / a ≥ √ 3 is obtained
b²≥3a²,
c²-a²≥3a²
c²≥4a²≥
e²=c²/a²≥4
That is: e ≥ 2