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limit as x goes to 0 of (((e^(2x^2)-1)/(2x^2)-(e^(arctan(2x^2))-1)/(arctan(2x^2)))/x^4
limit as x goes to 0 of (((e^(2x^2)-1)/(2x^2)-(e^(arctan(2x^2))-1)/(arctan(2x^2)))/x^4
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