[" Find a point on "yz" -plane which is equidistant from the points "A(3,2,-1),B(1,-1,0)" and "],[c(2,1,2)" ."],[" 2.Find a point on "Z" -axis which is equidistant from the points "(1,5,7)" and "(5,1,-4)" ."],[" 3.Find a point on "Y" -axis which is at a distance of "sqrt(21)" units from the point "(1,3,2)" ."],[" () "cot(-2,2,3)" and "B(1,3-2)" a distance of "sqrt(21)" units from the point "(1,3,2)" ."]