$\left(-9b^4c+5a\right)\left(5a+9b^4c\right)$

$\sqrt{-4}\left(\sqrt{2}-3\right)$

$\lim_{x\to\infty}\left(\frac{\:3x^2-8x+6}{x^2+9x-2}\right)$

$16x^{10}-8x^5+1$

$\lim_{n\to\infty}\left(\frac{p\left(1+i\right)^{n\cdot i}}{\left(1+i\right)^{n-1}}\right)$

$\int\left(\frac{1}{\sqrt{81x^2+1}}\right)dx$

$\left(2x^3+4x^2-8x+6\right)+\left(3x^2+9x-10\right)+\left(2x^2+5x-2\right)$