$\sqrt{2}\cdot\sqrt{9}$
$-x^2+10x-9\ge0$
$x-13=20$
$\int_{15}^{\infty}\left(\frac{6}{v^2-v}\right)dv$
$\frac{du}{dt}=\left(1+u\right)\left(4+t\right)$
$cosx\cdot secy\:dx+senx\cdot seny\cdot sec^2y\:dy=0$
$\frac{125a^3+27b^3}{5a+3b}$
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