$2ba^3-5xb^6+3nb^2-13bd^2$
$\frac{3x^2-19x+25}{3x-4}$
$\left(cos^2x\right)\left(csc^2x-1\right)=-cos^2x$
$\frac{d}{dx}\sqrt{6t}+\frac{\sqrt{7}}{t}$
$a\left(2^a-b\right)-2b\left(a-b\right)+ab\left(a+3\right)$
$\left|-12\right|-\left|14-9\right|$
$20+90+51\cdot0$
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