$$\frac{x^{\frac{1}{4}}}{x^{-\frac{1}{2}}}\frac{y^{\frac{1}{2}}2^{\frac{1}{3}}}{y^{\frac{1}{3}}2\frac{-1}{b}}$$
$-\frac{\sqrt[3]{2}\sqrt[6]{y}x^{\frac{3}{4}}b}{2}$
$-\frac{3\sqrt[3]{2}\sqrt[6]{y}b}{8\sqrt[4]{x}}$
