\[\boxed{\mathbf{17}\mathbf{.}}\]
\[\textbf{а)}\ y = \arcsin x;\ \ x \in \lbrack - 1;1\rbrack\]
\[x = \sin y;\ \ y \in \left\lbrack - \frac{\pi}{2};\frac{\pi}{2} \right\rbrack\]
\[y = \sin x;\ \ x \in \left\lbrack - \frac{\pi}{2};\frac{\pi}{2} \right\rbrack\]
\[\textbf{б)}\ y = \arccos x;x \in \lbrack - 1;1\rbrack\]
\[x = \cos y;\ \ y \in \lbrack 0;\pi\rbrack\]
\[y = \cos x;\ \ x \in \lbrack 0;\pi\rbrack\]
\[\textbf{в)}\ y = arctg(x);\ \ x \in R\]
\[x = tg\ y;\ \ y \in \left( - \frac{\pi}{2};\frac{\pi}{2} \right)\]
\[y = tg(x);\ \ x \in \left( - \frac{\pi}{2};\frac{\pi}{2} \right)\]
\[\textbf{г)}\ y = arcctg(x);\ \ x \in R\]
\[x = ctg(y);\ \ y \in (0;\ \pi)\]
\[y = ctg\ (x);\ \ x \in (0;\ \pi)\]