[" Q.12.If "P(0,1,2),Q(4,-2,1)" ,"],[" a...

[" Q.12.If "P(0,1,2),Q(4,-2,1)" ,"],[" and "0(0,0,0)" are three points,"],[" then "/_POQ=],[[" (a) "(pi)/(6)," (b) "(pi)/(4)],[" (c) "(pi)/(3)," (d) "(pi)/(2)]]

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