$\frac{x^4+2}{x^2+4x+5}$
$\frac{6x}{x^{2+4}}$
$x^4+3x^2-54$
$\left(-4+6\right)^2+\left(-4-2\right)^2$
$\frac{1}{\sqrt{x+1}}dx=ydy$
$\lim_{x\to0}\left(\frac{1-\cos^2\left(x\right)}{\sin^2\left(x\right)}\right)$
$x-10x+26$
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