$\int\frac{x}{\left(4x^2-25\right)^3}dx$

$\lim_{x\to0}\left(\left(1+2\sin\left(3x\right)\right)^{\left(40ta\right)}\right)$

$\frac{6x^4+3x^3-2x^2+9x+2}{2x+1}$

$\frac{d}{dx}\left(\ln\left(\frac{1+2x^2}{14-11x}\right)^4\right)$

$\left(a^2+3b^4\right)^2$

$2^3-3^2$

$\frac{2x^2-8}{3x-2\sqrt{1-4x}}$