$\left(4x^6+10x^4+3x^2-2x+4\right)x\left(2x^2-3x\right)$
$\left(2+8i\right)\left(5-7i\right)$
$5u\:-\:10u$
$-8y\:+\:3x\:-\:5x\:-\:2\:+\:y$
$y^2y'-4x=0;\:y\left(\frac{1}{2}\right)=0$
$\left(\frac{x}{y}\right)^{-1}$
$\int\frac{y}{y^4+2}dy$
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