$\lim_{x\to10}\left(\log x\right)$

$\lim_{x\to\infty}\left(\frac{2x+7}{3x^2-5}\right)$

$-20+-15+-10+-5+0+1+2+3$

$\lim_{x\to0}\left(\frac{\left(x\right)}{-\tan\left(x\right)}\right)$

$\frac{d}{dx}x^3y^2-x^5y+2xy^3=0$

$\frac{t}{y}dy+\left(1+\ln\left(y\right)\right)dt=0$