$\int_0^1\left(\frac{\left(2x\right)}{x^4+1}\right)dx$
$20+90+516c$
$\left(a^2-x^2\right)^2$
$\lim_{x\to3}\left(-\frac{7}{x-3}\right)$
$\frac{1}{1-\cos\left(x\right)}+\frac{1}{1+cos\left(x\right)}=\frac{2}{sin^2\left(x\right)}$
$5-2x>7-3x$
$\left(a^{3}b^{3}+a^{2}b^{2}\right)\left(\frac{1}{ab}\right)$
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