A drone is flying in the direction from IUT (I) to Uttara (U) to Tangail (T) and back to IUT forming a triangle. The co-ordinate of IUT and Uttara is (1, 2, 2) and (2, -1, 3). The vector from Uttara to Tangail can be represented by \( -4\text{i} - 2\text{j} + 2\text{k} \) . What angle the drone will make while travelling from Uttara to Tangail to IUT?

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