AP

MATHEMATICS · Single correct · AP · AP Precalculus · Exponential and Logarithmic Functions · Exponential and Logarithmic Functions

Problem

e^x=y+\sqrt{1+y^2}

, then

y=

(a)

\frac{e^x+e^{-x}}{2}

(b)

\frac{e^x-e^{-x}}{2}

(c)

e^x+e^{-x}

(d)

e^x-e^{-x}