$-4\left(x+1\right)\left(x^2-x+1\right)+3x\left(x-1\right)^2-2\left(x-3\right)\left(x+3\right)$

$\lim_{x\to0}\left(\frac{\sqrt{1+2x}\sqrt{1-4x}}{x}\right)$

$\sin\left(x-2^{\circ}\right).\csc\left(2^{\circ}-y\right)\:=1$

$\lim_{x\to-\infty}\left(-2x^3+9x^2+7x-6\right)$

$y^2\:+\:11y\:-\:6y\:+\:y^2$

$m^6+m^2$

$16x^4+24x^2+9x$