$-4\left(-12+\left(1-4\right)^2\right)$
$2r-3=r-3$
$14x^44$
$1+2\left(sin\left(x\right)cos\left(x\right)\right)=\left(\left(sin\left(x\right)+cos\left(x\right)\right)\right)^2$
$tan^3x\:cosx$
$\frac{x^3+27a^3}{x+3a}$
$\frac{216a^3-c^3}{6a-c}$
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