$30x^2y-20x^3+40y^2$
$\left(5+6b\right)^2\left(25+60b+36b^2\right)^3$
$x^2-x-152$
$\sin2x=2\sin^2x$
$\frac{\left(a^4\right)\:\left(a^3\right)}{a^4}$
$\frac{k}{3}=-13$
$\left(5n^2+6p^3\right)\cdot\left(5n^2-6p^3\right)$
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