$25a^2+10ab+4b^2+a^2+a^2b^2+b^2+a^2+y^2+z^2+y^2$

$7y-8^3$

$\left(5x^3+3\right)\left(2x^2-3x-1\right)$

$\left(\left(\frac{6}{1}\right)x\left(\frac{4}{4}\right)y-\left(\frac{4}{10}\right)\left(\frac{6}{1}\right)x+\left(\frac{4}{4}\right)y-\left(\frac{4}{10}\right)\right)$

$-2\tan\left(\sqrt[5]{5x^3-4x^2}-9\right)$

$\frac{9x^2+12x+4}{3x+2}$

$\lim_{x\to\infty}\left(\frac{e^x-1}{sin\left(9x\right)}\right)$