$100a^2-140ab^3$

$\lim_{x\to0}\left(\frac{sin\left(4x\right)}{tan\left(x\right)}\right)$

$\left(2t^2-t+3\right)\:\left(2t^2-1\right)$

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

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

$7k+4k$

$\left(x-2\right)^2\left(x+3\right)^2$