$x^2+8x+729$
$\lim_{x\to10}\left(\frac{3x^2-21x-90}{x-10}\right)$
$\frac{2x}{5}=16$
$3\left(\tan\left(225\right)^2\right)+\cot2\left(225\right)-3=0$
$-3x^2-9x+30$
$\int\frac{3x^3+5x}{x^2-1}dx$
$a^2-2ab+b^2\left(-ab\right)$
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