\[\boxed{\mathbf{42}\mathbf{.}}\]
\[\textbf{а)}\ y = a^{x};\ \ a > 0;\ \ a \neq 1;\ \ x \in R\]
\[y^{'}(x) = a^{x}\ln a.\]
\[\textbf{б)}\ y = e^{x};\ \ e > 0;\ \ e \neq 1;\ \ x \in R\]
\[y^{'}(x) = e^{x}.\]
\[\textbf{в)}\ y = \log_{a}x;\ \ a > 0;\ \ a \neq 1;\ \ \]
\[x > 0\]
\[y = \frac{1}{x\ln a}.\]
\[\textbf{г)}\ y = \ln x;\ \ a > 0;\ \ a \neq 1;\ \ \]
\[x > 0\]
\[y^{'} = \frac{1}{x}.\]