$2a^2+4ab+5ab-10b^2$

$2x-8\ge9x-70$

$\frac{dy}{dx}-\frac{x^2}{y^2}=0$

$cot\left(20\right)-\frac{sin\left(70\right)}{sin\left(20\right)}$

$\int\:\frac{t^2}{\left(t+1\right)^4}dt$

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

$3\left(\frac{2}{3}\right)\:-\:8$