$\int_0^{x^2}\frac{1}{x^2}dx$

$\sqrt[n]{x^n\sqrt[n]{x^{n^2}\sqrt[n]{x^{n^3}\sqrt[n]{x^{n^4}...\sqrt[n]{x^{n^n}}}}}}$

$-\frac{5\left(2\sqrt{x}+5\right)}{-4x+25}$

$\int\left(2x^2+3\right)\frac{1}{3}dx$

$\frac{dy}{dx}\left(x^{4^x}\right)$

$\int\left(\frac{\sqrt{x+4}}{x^2}\right)dx$

$\int\frac{4x^2+2x}{\left(x-2\right)\left(x^2+1\right)}dx$