$2^2+9x^4+4$
$\left(x^2+1\right)y'+y=0$
$\frac{1-m^4}{1+m^2}$
$\:\:\:\:\:\:2\left(10\right)+\left(-7\right)$
$2,15-2,43$
$\int\left(\frac{lnx^6}{7x}\right)dx$
$\left(x^2+7x+12\right)+\left(x^2-2x-24\right)$
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