$\frac{dy}{dx}=\frac{1}{y^2-2y-1}$
$-5\cdot\frac{-2}{5}$
$a-15=-15$
$-5x-3$
$7x^2+6x+x^3+4\left(x+5\right)$
$2\tan^2x-\sec^2x$
$x^2+8x+720$
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