$-x^3+4x^2-3x$

$\frac{8}{8}a^2b+\frac{1}{4}a^2b-a^2b$

$2.86\:=\:2.6\left(u\:+\:-2.3\right)$

$\frac{cos^2\left(3x^2+1\right)}{x^4-3}$

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

$x-15-\frac{x-6}{15}\ge2x-3+\frac{x-4}{9}$

$\int\frac{4x^2+8x+139}{\left(x^2+6x+11\right)\left(x+10\right)}dx$