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

$\int sin\left(x\right)sec^5\left(x\right)dx$

$y'\:+\:tan\left(x\right)y\:=\:2\:sin\left(x\right)\:cos^2\left(x\right)$

$\left(x-1\right)\left(x-20\right)$

$2-\left(3-2+5-1\right)+2\cdot\left(3-6\right)$

$8\sin\left(x\right)=2+\frac{5}{\csc\left(x\right)}$

$4\:+\:36\::\:9\:-\:50\::\:\left[12\:+\:\left(17\:-\:4\right)\right]$