5. (a) Given A = a,5-ay2 + a₂, find the expression of a unit vector of B such that B/A and BL A, if B lies in the xy-plane. (b) Write the expression of the vector going from point P₁ (1, 3, 2) to point P2 (3, -2, 4) in Cartesian coordinates. What is the length of this line?

Q: a= b=

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Q: help

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