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[" If "lim(x rarr0)((cos4x+a cos2x+b)/(x...

[" If "lim_(x rarr0)((cos4x+a cos2x+b)/(x^(4)))" is finite then the "],[" value of "a,b" respectively "],[[" 1) "5," 2) "-5,-4," 3) "-4,3," 4) "4,5]]

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