$\lim_{x\to3}\left(\frac{x-3}{2x}-3x\right)$

$\frac{5}{6}\left(0.5-1\right)^{-2}-\left(0.1\right)^{-1}+0.6666-\sqrt[3]{-0.125}$

$\int\ln\sqrt{5u+3}du$

$-9\cdot21$

$\left(2x^2-1\right)\left(4-5x^3\right)$

$\left(25x^2y^4-121\right)\left(25x^2y^4+121\right)$

$\int\frac{3^x}{3}dx$