Show that the girl at A can throw the ball to the boy at B by launching

Question:

Show that the girl at A can throw the ball to the boy at B by launching it at equal angles measured up or down from a 45° inclination. If v_A = 10 m/s, determine the range R if this value is 15°, i.e., θ₁ = 45° -15° = 30° and θ₂ =45° +15° = 60°. Assume the ball is caught at the same elevation from which it is thrown.