$\left(85x\:-3\right)\::\:\left(-2\right)\:\ge\:x\:+\:26$

$\int\frac{x}{sqrt\left(x^2-8x+25\right)}dx$

$1+x^8-\frac{1}{2}+\frac{1}{x^8}$

$15x^3y-16x^3y-14x^3y$

$\int xsin\left(x^2+5\right)dx$

$\frac{dy}{du}=\:\frac{1}{\sqrt{1-\frac{u^2}{a^2}}}$

$\frac{2x^3+3x^2+7x+6}{x+1}$