Mathematics

Mathematics

Problem

If the co-ordinates of the points A,B,CA, B, C be (−1,3,2),(2,3,5)(-1, 3, 2), (2, 3, 5) and (3,5,−2)(3, 5, -2) respectively, then ∠A=\angle A = (a) 0∘0^\circ (b) 45∘45^\circ (c) 60∘60^\circ (d) 90∘90^\circ

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