$\left(2t^2-5t-3\right)+\left(6t^2-7t+4\right)$

$\int\left(\sqrt{x}\left(1+x^{\frac{3}{2}}\right)^5\right)dx$

$\lim_{x\to\infty}\left(e^{x^3-3}\right)$

$4\left(x+y\right)^2$

$\frac{z}{1}+\frac{s}{st}+\frac{t}{z}\cdote$

$\int9xsinx\left(x\right)dx$

$\frac{dy}{dx}-x^2y=y+x^2$