Find the angle between the two planes 2x+2y+z=2 and x-y+z=1? – McqOptions

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1.	Find the angle between the two planes 2x+2y+z=2 and x-y+z=1?
A.	(cos^{-1} frac{ u20611}{3} )
B.	(cos^{-1} u2061 sqrt{3} )
C.	(cos^{-1} u2061 frac{1}{3} )
D.	(cos^{-1} u2061 frac{1}{3 sqrt{3}} )
Answer» E.

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