1.

Let P(1,-2,5) be the foot of the perendicular drawn from the origin to the plane pi_(1) and the same P be the foot of the perpendicular from (1,2,-1) to the planes, pi_(2). Then the acute angle between the planes pi_(1)andpi_(2) is

Answer»

`COS^(-1)((19)/(SQRT(390)))`
`cos^(-1)((19)/(sqrt(340)))`
`cos^(-1)((19)/(sqrt(370)))`
`cos^(-1)((19)/(sqrt(350)))`

ANSWER :A


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