$\left(65\right)+\left(-89\right)+\left(134\right)+\left(-469\right)+\left(823\right)$

$\int\:coth\left(3x\right)dx$

$\left(12x-3y\right)^2$

$\left(12c-10d\right)^2$

$\lim_{x\to\infty}\left(x\cdot\ln\left(x-4\right)-\ln\left(x+2\right)\right)$

$\frac{dy}{dx}+\frac{cos\left(x\right)}{\sin\left(x\right)}y=\frac{1}{\sin\left(x\right)}$