If ( a +3 b ) is perpendicular to (7 a -5 b ) and ( a -4 b ) is perpendicular to (7 a -2 b ), then the angle...

Question

If ( a +3 b ) is perpendicular to (7 a -5 b ) and ( a -4 b ) is perpendicular to (7 a -2 b ), then the angle between a and b (in degrees) is________.

Accepted Answer

60

JEE Main 2021 Mathematics question