$28-\left(-20\right)+\left(-16\right)$
$xdx+4ydy=0$
$x^3-7.5+3$
$2tan^2\left(a\right)\:-\:sec^2+2$
$\int\left(\tan\left(3x\right)+\sec\left(3x\right)^2\right)dx$
$\left(a^3-5\right)\left(a^2-2\right)$
$\frac{\left(x-y\right)^2z^2}{\left(x-y\right)-2}$
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