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`pi_1` is a plane passing through the point (1,2,3) and perpendicular to the planes x+2y+3z -6 =0, x+2y+2z -5 =0 .
if (-1,2,-3) is the foot of the perpendicular drawn from the point (1,3,2) on to a plane `pi_2` ,then the angle between the planes `pi_1 and pi_2` is

A

`cos ^(-1) (9/(sqrt(255)))`

B

`pi/4`

C

`cos ^(-1) (sqrt6/(10))`

D

`pi/2`

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The correct Answer is:
C
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