$4x^2\cdot4x^2$

$6x+2x+x^2+1$

$\cot^4\left(x\right)+\cot^2\left(x\right)=\cot^2\left(x\right)\cdot\csc^2\left(x\right)$

$\lim_{x\to\infty}\left(\frac{-12^{x+1}}{2^x}\right)$

$\lim_{x\to\infty}\left(\frac{4x}{4-x^2}\right)$

$\int\frac{x^3}{\sqrt{x^2+2}}dx$

$\left(x+5\right)\cdot\left(x+6\right)$