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[" 53.If "x>-(1)/(sqrt(3))," then "tan^(...

[" 53.If "x>-(1)/(sqrt(3))," then "tan^(-1)((3x-x^(3))/(1-3x^(2)))" equals "],[[" (a) "3tan^(-1)x," (b) "-pi+3tan^(-1)x]]

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