$b^6-27c^6$
$84-\left[9+32\left(19-18\right)\right]$
$\left(-x^a\right)\left(-x^{a+2}\right)$
$\int_x^4\left(\tan^2\left(u\right)\cos\left(u\right)\right)du$
$8cos^2x=4-4cos2x$
$\left(8x^2-2y^3\right)^2$
$\frac{-3+3x+24y}{3x-12+6y}$
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