$\lim_{x\to\infty}\left(1-\frac{2x}{x^2-1}\right)^{-4x}$
$y2\:-\:9y\:+\:20$
$\int\frac{e^x}{\left(2e^x+3\right)^{\frac{3}{2}}}dx$
$\frac{csc\:t\:-\:sin\:t}{cos\:t}$
$8+4-15-76$
$\:-40+\:20+\:40\left(-2\right)$
$9a^2-12a+4$
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