What is the acute angle between the planes \[x+y+2z=3\] and \[-2x+y-z=

1.	What is the acute angle between the planes \[x+y+2z=3\] and \[-2x+y-z=11?\]
A.	\[\pi /5\]
B.	\[\pi /4\]
C.	\[\pi /6\]
D.	\[\pi /3\]
Answer» E.

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What is the acute angle between the planes \[x+y+2z=3\] and \[-2x+y-z=11?\]

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