$\frac{\left(86\right)^{-6}}{\left(2b\right)^{-3}}$
$16x^6-24x^3+9$
$x+27=-9$
$\left(a-1\right)\left(a+1\right)-\left(a+1\right)^2-\left(a-1\right)^2+3a\left(a+6\right)$
$5x^2y+10xy+5y$
$dy=x^4y^2dx$
$1-\frac{cos^{4x}}{sen^4x}$
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