$\frac{dy}{dx}=\frac{-y\ln\left(x\right)}{x\ln\left(y\right)}$

$\lim_{x\to7}\left(\frac{x^2-49}{x^2-7x}\right)$

$3^2-234+4^2$

$-7\:+\:14\:+\:\left(-30\right)\:10\left(-9\right)$

$\left(\frac{t+3}{-1+3}\right)\cdot\left(\frac{t-0}{-1-0}\right)\cdot\left(\frac{t-2}{-1-2}\right)$

$\lim_{x\to\infty}\left(\sin\left(x\right)\right)^x$

$5^3+2^2$