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The angle between a normal to the plane ...

The angle between a normal to the plane : `2x-y+2z-1=0` and the z axis is:

A

`cos^-1(1/3)`

B

`sin^-1(2/3)`

C

`cos^-1(2/3)`

D

`sin^-1(1/3)`

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MODERN PUBLICATION-Three Dimensional Geometry-EXERCISE
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