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B
45∘
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C
60°
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Solution
The correct option is C60° Weknowthat→A.→B=ABcos∅and∣∣
∣∣→A×→B∣∣
∣∣=ABsin∅where∅istheanglebetweenthevectors.So,∣∣∣→A×→B∣∣∣→A.→B=ABsin∅ABcos∅=tan∅⇒tan∅=3√33⇒tan∅=√3∴∅=60∘