Cosine of the angle between the lines r = 5 i - j + 4 k + ( i + 2 j + 2 k ) and r = 7 i + 2 j + 2 k + (3 i +...

Question

Cosine of the angle between the lines r = 5 i - j + 4 k + ( i + 2 j + 2 k ) and r = 7 i + 2 j + 2 k + (3 i + 2 j + 6 k ) is

Accepted Answer

(C)

MHT CET Mathematics question