$\:-x^2+4x-7=0$
$\left(x-3\right)\left(x-4\right)$
$\lim_{x\to\infty}\left(x^2+3\right)^{\frac{5}{x^2}}$
$\left(a^2-9d^3\right)^3$
$9-6cd+c^2d^2$
$\left(2x+1\right)^2-\left(\sqrt{x}\right)^2$
$\tan\left(\frac{x}{2}\right)+\ctgx^{-1}$
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