$\sqrt{x}\sqrt{\sqrt{x}+1}$
$\left(2x^4-7\right)^2$
$\left(8a\:\:+\:7b\:\:\right)\left(\:8\:a\:-\:7b\right)$
$\int\left(6x\ln\left(x^2\right)\right)dx$
$\frac{\cos^2\theta}{1-\sin\theta}=1+\text{sen}\theta$
$a+b+a-b-2a-b$
$\left(-3b-5c\right)\left(3b-5c\right)$
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