$\frac{t^4-y^4}{t-y}$

$\lim_{x\to0}\left(\frac{3^{\sin\left(x\right)}-1}{2x}\right)$

$2x\:+\:2\:=\:3\:+\:x\:$

$\int\frac{p\left(x\right)}{x^3\:+\:2\:x^2\:-\:3\:x\:-\:10}dx$

$x^2-6x=86$

$\lim_{x\to2}\left(\frac{x^3-2x^2+x-2}{x^2+x-6}\right)$

$\int\frac{2x^2+9x+11}{\left(x+2\right)\:\left(x+3\right)^2}dx$