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[" If "r],[" If "Lt(cos4x+a cos2x+b)/(x ...

[" If "r],[" If "Lt(cos4x+a cos2x+b)/(x rarr0)(2)/(x^(4))" is finite then "a-b=],[[" 1) "-1," 2) "1," 3) "7," 4) "-2]]

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