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Maths-

General

Easy

Question

The angle between the planes 2x-y+z=6,x+y+2z=7 is

${C o s}^{- 1} (\frac{4}{\sqrt{21}})$
$π / 3$
$π / 4$
$π / 2$

The correct answer is: $pi divided by 3$

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