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The angle between the planes x+y+z=1 and...

The angle between the planes x+y+z=1 and x-2y+3z=1 is

A

`cos^(-1)((2)/(sqrt42))`

B

`cos^(-1)((5)/(sqrt42))`

C

`cos^(-1)((3)/(sqrt42))`

D

`cos^(-1)((1)/(sqrt42))`

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