$\left(-9+4i\right)\left(9+i\right)$
$i\left(x\right)=\frac{x}{x}$
$yd=0$
$\left(xy^5+m^4\right)\left(xy^5+n^2\right)$
$\left(x-2y\right)\frac{dy}{dx}+2x+y=0$
$\lim_{x\to0}-\left(x\sqrt{7+x^{-2}}\right)$
$19\cdot15\cdot150$
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