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Let vectors →a and →b make an angle θ=2π3 between them. If ∣∣→a∣∣=1 and ∣∣∣→b∣∣∣=2, then ∣∣∣(→a+3→b)×(3→a−→b)∣∣∣2 is |
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Answer» Let vectors →a and →b make an angle θ=2π3 between them. If ∣∣→a∣∣=1 and ∣∣∣→b∣∣∣=2, then ∣∣∣(→a+3→b)×(3→a−→b)∣∣∣2 is |
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