$\left(5m^3n^3a^3\right)\left(-4m^2n^2a^2\right)$

$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2\ln\left(1+x\right)}{x\left(e^x-1\right)}\right)$

$\lim_{x\to3}\left(20\right)$

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

$y'-xy=x-1$

$\int\frac{t^4+4t^3+t^2+1}{t^2+1}dx$

$\sqrt{4^2}-4\left(-1\right)\left(-2\right)$