$x^2-\left(x+1\right)^2$

$4m^2-4mn+n^2$

$\:\:\left(-\frac{1}{2}xy^2+3z^4\right)\left(3z^4+\frac{1}{2}xy^2\right)$

$\lim_{x\to3}\left(\frac{\sqrt[4]{3x^2-11}-2}{\sqrt[5]{2x^2+14}-2}\right)$

$\frac{sinxcos^2x+sin^3x}{sin^2x}=cscx$

$\lim_{x\to0}\left(\frac{4}{\sin\left(5x\right)}\right)$

$x^2-x-56<0$