$\frac{4x^3-5x^2-2x+1}{x-1}$

$\sec^2\left(x\right)-2\tan^2\left(x\right)=-2$

$\frac{1}{1-tan^2\left(x\right)}+\:\frac{1}{1-cot^2\left(x\right)}=1$

$3x+9<11x+6$

$\frac{d}{dx}x^2+y^2-4xy=0$

$\left(-4b+d\right)^3$

$-\frac{32}{81}\left[\left(\frac{\sqrt{4-9\left(\frac{2}{3}\right)^2}}{\frac{2}{3}}\right)^3-\left(\frac{\sqrt{4-9\left(\frac{2}{3}\right)^2}}{\frac{2}{5}}\right)^5\right]$