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[" 21.If the curves "ax^(2)+4xy+2y^(2)+x...

[" 21.If the curves "ax^(2)+4xy+2y^(2)+x+y+5=0" and "],[+6xy+5y^(2)+2x+3y+8=0" intersect at "],[" concyclic points then the value of "a" is "],[[" (a) "4," (b) "-4," (c) "6," (d) "-6]]

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