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Find the angle between planes r . (i + j + 2k) = 13 and r . (2i - j + k) = 31.

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The acute angle θ between the planes \(\bar{r} . \bar{n_1} = \bar{d_1}\) and \(\bar{r} . \bar{n_2} = \bar{d_2}\) is given by

∴ from (1), we have

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