The angle between a pair of lines whose d.r.s. are 1, 1, 2 and 3 - 1, - 3 - 1, 4 is ............

MHT CET Mathematics question

The angle between a pair of lines whose d.r.s. are and is ............

Answer: (C)

Dot product . and d_2\sqrt\sqrt{3}1)^2$ +

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Question ID VK-027146