$\left(6x^4-5y^8\right)^2$

$\frac{x-4x+3}{x-1}$

$\lim_{x\to1}\left(\frac{e^x-1}{x^{14}}\right)$

$b^2-b^5$

$\int\left(\frac{x}{\left(0.2-0.2x\right)\cdot\left(0.5-0.4x\right)}\right)$

$\int_1^{\sqrt{3}}\frac{1}{arctan\left(z\right)\left(1+z^2\right)}dz$

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