$y'=\frac{x^6}{y}$
$\left(x-a\right)\left(x+a\right)=x^2-a^2$
$\int\frac{19x+4}{2x^2+7x-4}dx$
$144:\:18.\:\left(-9\right)$
$fb=n$
$\left(7x+4y\right)\left(7x+4y\right)$
$y'-\left(sin^2x\right)\left(sin^22y\right)=0$
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