$-3\left(r-4\right)>0$
$7+10y=10y+7$
$\lim_{x\to0}\frac{ln\left(1+x^2\right)}{x^4}$
$yux=xuy$
$\left(8a\right)\left(25x\right)$
$\left(2xy^2+\frac{1}{x^2+1}\right)dx+2x^2ydy$
$\int\frac{\left(1\right)}{x^3\sqrt{\left(x^2-a^2\right)}}dx$
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