Let a and b be two unit vectors. If the vectors c = a + 2b and d = 5a - 4b are perpendicular to each other, then the angle between a and b is

Let hata and hatb be two unit vectors. If the vectors vecc=hata+2hatb and vecd=5hata-4hatb are perpendicular to each other then the angle between hata and hatb is (A) pi/2 (B) pi/3 (C) pi/4 (D) pi/6

Let hata and hatb be two unit vectors. If the vectors vecc=hata+2hatb and vecd=5hata-4hatb are perpendicular to each other then the angle between hata and hatb is (A) pi/2 (B) pi/3 (C) pi/4 (D) pi/6

Let hata and hatb be two unit vectors. If the vectors vecc=hata+2hatb and vecd=5hata-4hatb are perpendicular to each other then the angle between hata and hatb is (A) pi/2 (B) pi/3 (C) pi/4 (D) pi/6

Let veca and vecb be two unit vectors if the vectors vec c=hata +hat2b and vecd=5 hata -4hatb are perpendicular to each other then the angle between hata and hatb is

If a and b are two unit vectors such that a+2b and 5a−4b are perpendicular to each other, then the angle between a and b is

If vec a and vec b are two unit vectors such that vec a+ vec b and vec a−2 vec b are perpendicular to each other, then the angle between vec a and vec b is

If vec a and vec b are two unit vectors such that vec a + 2 vec b and 5 vec a - 4 vec b are perpendicular to each other then the angle between vec a and vec b is