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$\int_0^{+\infty}\left(\frac{1}{x^2+4x+5}\right)dx$
$\lim_{x\to\infty}\left(\frac{x^2+senx}{x^2-3x}\right)$
$sin^4x-sin^2x$
$\left(10x^2+32x-45\right)-x^3-6x^2+32x$
$2cos^2x+4=5-cosx$
$\left(\sqrt{31}\right)^2-\left(x-21\right)^2\le0$
$-6m+2-4m+5$
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