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[" If the quadratic equation "ax^(2)+bx+...

[" If the quadratic equation "ax^(2)+bx+c=0(a>0)" has "sec^(2)theta" as its roots,than which of the following "],[" must hold good "],[[" (A) "c=0," (B) "c^(2)-4ac>=0," (c) "c>=4a," (D) "4a+b>=0]]

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