$\frac{-3x^3}{2x^2}$
$-x^2+9x-20$
$\left(5b-2\right)^2+4=25b^2-20b$
$2g-6g$
$b^2a-b^2a$
$\frac{\left[cos\:\left(3x\right)\:-cos\:\left(15x\right)\:\right]}{2}$
$\left(-19\right)-\left(-4\right)$
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