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Find the angel between any two diagon...

Find the angel between any two diagonals of a cube.

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The direction ratios of OP are `a, a and a` or 1, 1 and 1 and those of `AL` are `-a, a and a, or -1, 1 and 1`. Therefore,
`" "costheta=(-1+1+1)/(sqrt(3)*sqrt(3))=(1)/(3) or theta=cos^(-1)""(1)/(3)`
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