$20+90+510$
$\lim_{x\to1}\left(\frac{x^2+2x}{e^{3x}-1}\right)$
$3x^2-6x-24=0$
$12x+4=8x+16$
$csc\left(a\right)csc\left(b\right)cos\left(a+b\right)$
$\int_1^{\infty}\left(\frac{2}{x^2}\right)dx$
$\left(x^3-2\right)\left(x^3+21\right)$
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