Question: (a) Find the Euclidean angle between the vectors (1, 1, 1, l)T and (1,1,1, -l)T inR4. (b) List the possible angles between (1, 1, 1,

(a) Find the Euclidean angle between the vectors (1, 1, 1, l)T and (1,1,1, -l)T inR4.
(b) List the possible angles between (1, 1, 1, l)T and (a1, a2, a3, a4)T, where each a,- is either 1 or -1.

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