\[{\color{Blue} Q1-b)}\\(e^{x}+e^{-x})\frac{dy}{dx}=(e^{x}-e^{-x})\\dy=\frac{e^{x}-e^{-x}}{e^{x}+e^{-x}}dx\\y=ln(e^{x}+e^{-x})+lnC\\y=lnC(e^{x}+e^{-x})\]
\[{\color{Blue} Q1-b)}\\(e^{x}+e^{-x})\frac{dy}{dx}=(e^{x}-e^{-x})\\dy=\frac{e^{x}-e^{-x}}{e^{x}+e^{-x}}dx\\y=ln(e^{x}+e^{-x})+lnC\\y=lnC(e^{x}+e^{-x})\]
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