$\left(-4\right)\left(7\right)+\left(-2\right)\left(-3\right)$

$\left(x+2\right)\left(x+3\right)m$

$\lim_{x\to\infty}\left(\left(x^4+3x-1\right)^{\frac{1}{n}}\right)$

$x^2+62x+971$

$\frac{d^2}{dx^2}\left(-\cos\left(-x\right)\right)$

$-x^3+x^2-x+1$

$\frac{36x^2-y^2}{6x-y}$