1.

A(2,3,5), B(a,3,3) and C(7,5,beta) are the vertices of a triangle. If the median through A is equally inclined with the co-ordinate axes, then cos^-1(alpha/beta)=

Answer»

`cos^-1((-1)/9)`
`pi/2`
`pi/3`
`cos^-1(2/5)`

ANSWER :A


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