The angle between the planes 2x + y + z = 11 and x – 2y + z = 5 is :
The angle between the planes 2x + y + z = 11 and x – 2y + z = 5 is :
(A) cos-1\(\frac{1}{6}\)
(B) cos-1\(\frac{1}{3}\)
(C) \(\frac{\pi}{4}\)
(D) None of these
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