∣a∣=6, ∣b∣=2, a⋅b=∣a∣∣b∣cos60∘=6⋅2⋅1/2=6. ∣a−b∣2=∣a∣2+∣b∣2−2a⋅b=36+4−12=28. So ∣a−b∣=28=27.
If ∣a∣=3∣b∣, ∣b∣=2 and angle between a and b is 60∘, then ∣a−b∣ is equal to:
Held on 10 Aug 2022 · Verified 13 Jul 2026.
14
27
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25
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