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[" 20.The equation "tan^(4)x-2sec^(2)x+a...

[" 20.The equation "tan^(4)x-2sec^(2)x+a^(2)=0" will have "],[" atleast one real solution,if "],[[" (a) "|a|<=4," (b) "|a|<=2],[" (c) "|a|<=sqrt(3)," (d) None of these "]]

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