$\sqrt{\sqrt{x^2-5}}$
$\frac{x^{15}}{x^4}+x+1$
$tg^2x+ctg^2x-2$
$_{\left(y^2-5\right)}^2$
$25x^4+40x^2+16$
$5x^2-y^2-9=0$
$\frac{x^3+28x-48}{x+4}$
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