$\lim_{x\to0}\left(2-\ln\left(x\right)\right)^{x\:\sin\left(x\right)}$

$\left(1-x\right)\cdot y'-y-2=0$

$\left(+1\right)\cdot\left(+24\right)$

$\frac{x-4}{x+5}<4$

$\frac{\left(\tan\:\left(x\right)-\sec\:\left(x\right)\right)}{1-\sin\:\left(x\right)}$

$\frac{18x^3+33x^2-40-75}{3x+5}$

$\frac{d}{dx}2x^2y^3$