$2a\cdot\left(4a^3-3a^2\right)$
$\frac{15a+20ab}{-5a}$
$\int\left(\frac{1}{\left(25x^2+49\right)}\right)dx$
$3x^2-12x$
$18-\left(-15\right)-6-5+10$
$\left(a-b+c\right)\left(a+b-c\right)$
$\sin\left(90\right)+4\cos\left(0\right)-2\sin\left(270\right)$
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