$25x^4+60x^2y^3+36y^6$
$1,2+1,3$
$64a^3+343+4a+7$
$\sqrt{\left(x+4\right)\left(x+2\right)}$
$\left(2x-y^5\right)^2$
$7x^6+14x^2-21x$
$\lim_{x\to0}\left(\frac{7-sin\left(x\right)-7x}{4x-2e^x+2e^{-x}}\right)$
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