Tangents are drawn to the parabola (x−3)2+(x+4)2=(3x−4y−6)225 at the extremities of the chord 2x−3y-18=0 Then the angle between the tangents is

The given chord 2x−3y−18=0 satisfies the point (3,−4) which is the focus of the given parabola. Hence, it is a  focal chord and the tangents at extremities are perpendicular.