JEE Main 2019 Mathematics question
A plane which bisects the angle between the two given planes 2x − y + 2z − 4 = 0 and x + 2y + 2z − 2 = 0, passes through the point:
Answer: (D)
Solution
Bisectors: x − 3y − 2 = 0 and 3x + y + 4z − 6 = 0; (2, −4, 1) lies on the second.