$\frac{1}{3}e^x+\frac{5}{3}e^{-2x}+\left(\frac{2}{3}e^x-\frac{10}{3}e^{-2x}\right)$

$\frac{2}{3}xy-\frac{1}{6}xy-\frac{1}{2}x^{2}y^{2}-\frac{3}{4}xy-2x^{2}y^{2}$

$\lim_{x\to\frac{\pi}{4}}\left(tgx-1\right)x\left(sec2x\right)$

$\frac{a^6b^9-5a}{a^2b^3-6c^4}$

$25\left(1+17.10^{-6}\right)30-0$

$.36^{1.5}$