$3-4\:\left|4-\left(5-7\right)\right|-\left\{9-\left|5-\left(-1\right)\right|\right\}$
$\frac{4x^2-3}{2x}$
$2.\left(3x-15\right)-4x+20=2$
$2a+4a^3-6a^2$
$2x\:+7x+3\:0$
$h^2+3h+12$
$\csc^2ydx=\csc xdy$
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