$x^2+19x+20=0$
$\int\left(8x^7\left(x^8-5\right)\right)dx$
$\left(w-3\right)\left(w-7\right)$
$\sin^2\left(z\right)-\cos^2\left(z\right)=\cos^2\left(z\right)$
$\lim_{x\to0}\left(5^{\frac{1}{x}}\right)$
$7a-9b+6a-4b-9a+18c$
$\lim_{x\to0}\left(cot\:x\frac{1}{x}\right)$
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