$t^3-9t^2=0$

$\lim_{x\to0}\left(\frac{6x^3}{6\sin\left(x\right)-6x+x^3}\right)$

$\left(x^{16}\right)\left(x^5\right)^3$

$\left(t+\frac{1}{t}\right)^{4}$

$\lim_{x\to0}\left(\frac{tan\left(x\right)}{1-e^x}\right)$

$\frac{cos^4x-sin^4x}{1-2sin^2x}$

$\int_5^{\infty}\left(\frac{1}{1+x^2}\right)dx$