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In the space A(bar(a)) is a point and ba...

In the space `A(bar(a))` is a point and `bar(b)` is a vector. If `P(bar(r ))` is any point such that `bar(r ) xx bar(b) = bar(a) xx bar(b)` then show that locus of P is a straight line.

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locus of P is a straight line.
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