1.

If ∣∣∣→a⋅→b∣∣∣=∣∣∣→a×→b∣∣∣, then the acute angle between →a and →b is (a) 30∘ (b) 45∘ (c) 60∘ (d) 90∘

Answer» If ab=a×b, then the acute angle between a and b is
(a) 30 (b) 45
(c) 60 (d) 90


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