$\left(r+s-1\right)\left(r+s+1\right)$
$x\left(x-2\right)-10$
$-5+a=1$
$380=-21\cos\left(\frac{2\pi}{29.5}d\right)+384$
$y'=3y+x$
$y^{\prime}=\frac{x^{2}}{y\left(1+x^{2}\right)}$
$\lim_{n\to\infty}\left(\frac{n^2}{n^2-1}\right)$
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