$4x+4+-9x+12y-10y$

$\lim_{x\to0}\left(\frac{\sin\left(x\right)-x}{\arccot\left(x\right)^2}\right)$

$\left(\frac{9}{x}-\frac{x^2}{2}\right)^2$

$\frac{dy}{dt}=-z\cdot y\left(t\right)$

$\left|-15\right|+\left|-12\right|$

$\lim_{x\to1}\left(\frac{x-1}{\left(1-x\right)^2}\right)$

$\int3t\sin\left(2t\right)dt$