$x^2-11x-180$

$\int\frac{5x^3}{\left(16-x^2\right)^{\frac{5}{2}}}dx$

$\lim_{x\to0}\left(\frac{6^x-5^x}{-9x}\right)$

$y'+25y=0$

$\int\left(\frac{1}{\left(x^2\sqrt{25-x^2}\right)}\right)dx$

$\frac{d}{dx}\left(2y^3+12y-2x^2-5x+2\right)=0$

$\frac{2x^5+31^3-22x^2+65x-55}{2x^2+5}$