Câu a.$y=(x-1)e^{2x}$
$y'=e^{2x}+(x-1).2e^{2x}=e^{2x}(2x-1)$
Câu b.
$y=x^2\sqrt{e^{4x}+1}$
$y'=2x\sqrt{e^{4x}+1}+x^2.\frac{2e^{4x}}{\sqrt{e^{4x}+1}}=2x(\sqrt{e^{4x}+1}+\frac{x.e^{4x}}{\sqrt{e^{4x}+1}})$
Câu c,d
$y=\frac{1}{2}(e^x+e^{-x})=\frac{e^x}{2}\pm \frac{1}{2e^x}$
$y'=\frac{e^x}{2}-_{+}\frac{1}{4e^{2x}}$