Q.
If the lengths of the sides of a rectangular parallelopiped are 3,2,1 then the angle between two diagonals out of four diagonals is
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a
cos−167
b
cos−123
c
cos−11314
d
cos−1914
answer is A.
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Detailed Solution
(a, b, c) = (3, 2, 1)cosθ=a2+b2−c2a2+b2+c2=67θ=cos−167
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