$\frac{ab^{-3}}{\left(ab\right)^{-2}}.\frac{a^3b}{b^{-2}}$
$\frac{12x^3+15x^2-6x}{3}$
$\sec\left(x\right)-\frac{\tan^2\left(x\right)}{\sec\left(x\right)}$
$\frac{\left(x^2+1\right)}{\left(3x-x^2\right)}$
$2x^2-6$
$\frac{49}{\left(-7\right)}$
$\frac{x}{2x^{2\:}+5x+2x}$
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