What is the derivative of f(x)=ex−e−x2f(x) = \frac{e^x - e^{-x}}{2}f(x)=2ex−e−x?
ex+e−x2\frac{e^x + e^{-x}}{2}2ex+e−x
ex−e−x2\frac{e^x - e^{-x}}{2}2ex−e−x
exe^xex
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