$\frac{d^2}{dx^2}\left(g\left(u.v\right)=\:-e^{3u.v}\right)$
$a+7^2$
$\left(\sqrt{7}+5a\right)\left(\sqrt{7}-5a\right)$
$\frac{3u+4}{-u-3}$
$\cos\left(\arccos\left(u\right)\right)$
$\left(a+b\right)^2=a^2+2ab^2+b^2$
$\frac{10x^3+20x+2\sqrt{2}}{\left(x^2+2\right)\left(x^2+1\right)}$
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