$8\left(4x^2y^{-3}\right)^{-2}$
$\frac{8x^3}{10x^5}$
$\log_x\left(30-4x-x^2\right)=2$
$x^4-9x^2+4x+12$
$6x^2-4x-3$
$\frac{\left(1-tan^22x\right)}{2\:tan^22x}$
$3x^2+12x+12$
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