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so you want a VERY HARD math question?!
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Lambert W Function (domain, range, approximation, solving equations, derivative & integral)
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Solving "a no solutions exponential equation" 2^2^x=16^16^16
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Lambert W Function
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到底要怎樣找出x^2=2^x的第三個解?
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Solving a 'Harvard' University entrance exam
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