$x^2+10x-21=0$

$\lim_{x\to\infty}\left(\frac{10\cdot3^x-2^{x-1}}{4^{x-1}}\right)$

$\lim_{x,y\to0,0}\left(\frac{1-\cos\left(x\right)}{xy}\right)$

$17xyz+3\cdot\left(2xyz-3xy\right)+8xy$

$\int\left(\left(7x-2\right)^3\right)dx$

$25m^2-60m+36=0$

$-\left\{2-\left[-4+48\right]\right\}$