$\frac{1-2\cos^2x+\cos^4x}{\sin^4x}$
$\int\frac{3x+12}{x^2-4}dx$
$3\cdot\frac{2\sqrt{5}}{\sqrt{5}}$
$5\cdot x-25>20$
$\left(\frac{1}{t}+1\right)\left(\frac{1}{t}+1\right)$
$\lim_{x\to\infty}\left(\sqrt{x}\cdot e^{-\frac{x}{3}}\right)$
$\int3t\left(t^2+3\right)^2dx$
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