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The vector bar(b)=3bar(i)+4bar(k) is to ...

The vector `bar(b)=3bar(i)+4bar(k)` is to be written as sum of a vector `bar(b)_(1)` parallel to `bar(a)=bar(i)+bar(j)` and a vector `bar(b)_(2)` perpendicular to `bar(a)` then `bar(b)_(1)` is equal to

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