$\left(\sqrt{9x+19}-6x-1\right)\left(\sqrt{9x+19}+6x+1\right)$
$9x^2+12x^3+4x^2$
$8x^3-80x$
$\left(t^2+7\right)\left(t^2-2\right)$
$tan\left(x\right)sin\left(x\right)=-sin\left(x\right)$
$\frac{\left(-34+-6\right)}{10}$
$\left(a+12\right)\left(a-5y\right)$
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