$\left(x-3y-5z\right)^2$
$\sin\left(x\right)+\sin\left(x\right)\cos\left(x\right)=0$
$81x^2-36xy+4y^2$
$6x^2+24x+24=0$
$\left(b+10\right)\left(b-9\right)$
$\lim_{x\to0}\left(\frac{7^{x+1}-8}{7^x}\right)$
$\int e^x\sqrt{1-e^x}dx$
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