I vector (a +26) is perpendicular to vector (5a - 46), then find the angle between a and b.

If vector (veca+ 2vecb) is perpendicular to vector (5veca-4vecb) , then find the angle between veca and vecb .

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If a,b are unit vectors such that the vector a + 3b is perpendicular to 7a - 5b then the angle between a and b is

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

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