The angle between a normal to the plane ...

The angle between a normal to the plane `2x - y + 2z -1=0` ad the Z-axis is a)`cos ^(-1) ((1)/(3))` b)`sin ^(-1) ((2)/(3))` c)`cos ^(-1) ((2)/(3))` d)`sin ^(-1) ((1)/(3))`

A

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

B

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

C

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

D

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

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The correct Answer is:

C

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