$27r^2-12$
$x^2-5^2+x^2+5^2-10x$
$x^{\frac{2}{3}}\:.\:x^{\frac{4}{3}}$
$\frac{x^{-4}}{x^5}$
$\left(x^3+27\right)^3$
$\left(a^2+2a+1\right)\left(a+1\right)$
$\frac{\tan^2\left(x\right)}{\sec\left(x\right)-1}$
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