$\lim_{x\to\infty}\left(\frac{3x-5}{3x+3}\right)^{2x+1}$

$\int\frac{2x^2+x}{\left(x-1\right)\left(x^2+x+1\right)}dx$

$\int t\cdot sec^22tdt$

$45\cdot2+45\cdot2+15\cdot2+45\cdot2+19\cdot2+11\cdot2$

$\left(x-3y\right)\left(c-d\right)$

$6u-3=-5\left(u+5\right)$

$-2x\ge x-8$