$\left(-x^4+7y\right)\left(7y+x^4\right)$
$\left(a^2b^5c\right)^0$
$\frac{cos\left(a\right)cot\left(\frac{\pi}{2}-a\right)}{sin\left(a\right)}$
$sin\left(-\frac{\pi}{2}\right)$
$[\frac{\left(2x+1\right)^{3}}{\left(x-4\right)}]$
$\sqrt{75x^4y^5}$
$x^2+2x-6$
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