$\frac{x^3}{x^2-4}-x$

$9x+1\sqrt{27x^2+48x+5}$

$\left(m^2+m+7\right)\left(m^2+m+4\right)-\left(m^2+m+8\right)\left(m^2+m+2\right)$

$\int x\left(8x^3-12x^2+6x-3\right)dx$

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

$\frac{x^6+4x^4+4x^2+16}{x^2+4}$

$2\sin^2x+2=7\cos x$