$9x^2+30x^2+10$

$\int_1^{\infty}\left(71\:\frac{ln\left(x\right)}{x}\right)dx$

$\left(-30\right):\left[\left(+18\right):\left(-3\right)\right]$

$\lim_{t\to0}\left(\frac{\left(e^t-1\right)^2}{t\:sin\left(t\right)}\right)$

$\frac{2.86^x}{1.43^x}$

$\lim_{t\to\infty}\left(\frac{e^t-t^2}{e^t-t}\right)$

$\frac{dy}{dx}=\left(x^2\cdot y^2\right)$