$\frac{d}{dx}\sqrt{\frac{a^2-x^2}{a^2+x^2}}$
$\frac{4}{x^2+5x-14}$
$2.65^2$
$5-x^2+3+x$
$-2\left(q-4\right)$
$xy\left(x^2y^3+x^3y^3\right)$
$-\left(1-2x\right)^2$
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