$\lim_{x\to1}\left(\frac{x^2+x+2}{x^2-1}\right)$

$\frac{4\sqrt{x^7}-3\sqrt{x^5}}{\sqrt{x^3}}$

$n^2+2nr+r^2$

$z^4+10z^2+24$

$8-\left(-3\right)+\left(+3\right)-\left(+3\right)$

$\lim_{x\to\infty}\left(\frac{ln\left(x^2\right)+1}{x}\right)$

$\cot\left(x\right)+\csc\left(x\right)=1+\frac{\cos\left(x\right)}{\sin\left(x\right)}$