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If a and b are two unit vectors inclined to X-axis at angles 30^(@) and 120^(@), then |a+b| is equal to |
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Answer» `SQRT((2)/(3))` `implies a.b=0` `:. |a+b|^(2)=a^(2)+b^(2)+2a.b=1+1+0=2` `implies |a+b|=sqrt(2)` |
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