(i) Find the angle bewteen the lines who...

(i) Find the angle bewteen the lines whose direction ratios are 1, 2, 3 and - 3 , 2 , 1
(ii) Find the angle between two diagonals of a cube.

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The correct Answer is:

`cos^(-1)((2)/(7)) cos^(-1)((1)/(3))`

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