JEE Main2019Math
Q.
Let A(3, 0 –1), B(2, 10, 6) and C(1, 2, 1) be the vertices of a triangle and M be the mid point of AC. If G divides BM in the ratio, 2 : 1 then cos(GOA) (O being the origin) is equal to :
- A
- B
- C
- D
Solution
Let A(3, 0 –1), B(2, 10, 6) and C(1, 2, 1) be the vertices of a triangle and M be the mid point of AC. If G divides BM in the ratio, 2 : 1 then cos(GOA) (O being the origin) is equal to :