$\left(-1\right)^6$
$\left(x^2-3xy-y^2\right)+\left(9y^2-8xy+19x^2\right)$
$\left(18+3x^2+11x\right)\left(x+9\right)$
$\lim_{x\to0}\left(\left(1-6x\right)^{\frac{1}{x}}\right)$
$\lim_{x\to\infty}\:x\frac{3}{2}\sin\left(\frac{1}{n}\right)$
$\frac{3}{\:x+8}+\frac{x}{x-4}=\frac{7x+9}{x^2+4x-32}$
$x^2-18x+16+8x^2+25x-16$
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