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Measure of angle between the planes ba...

Measure of angle between the planes
`barr.(2i -j - 2k)=3` and `barr.(8i - j - 4k)=5` is

A

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

B

`cos^(-1)(2/3)`

C

`cos^(-1)(4/3)`

D

`cos^(-1)(5/3)`

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The correct Answer is:
A, B, C, D
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MARVEL PUBLICATION-PLANE IN SPACE -TEST YOUR GRASP- CHAPTERS 6,7,22
  1. Measure of angle between the planes barr.(2i -j - 2k)=3 and barr.(8i...

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