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plot y=(cos(1/x))^(x^2.5), y=(1-1/(2x^2) + x^(-4)/24)^(x^2.5) for 2 <= x <= 3
plot y=(cos(1/x))^(x^2.5), y=(1-1/(2x^2) + x^(-4)/24)^(x^2.5) for 2 <= x <= 3
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