\[\boxed{\mathbf{85.}}\]
\[\textbf{а)}\ y = \sqrt[3]{x} + \sqrt[4]{2 - x}\]
\[\textbf{б)}\ y = 2^{x} + \sin x\]
\[\textbf{в)}\ y = tgx - \log_{3}x\]
\[\textbf{г)}\ y = ctgx + \sqrt[3]{x^{2}}\]