$40^{4}+8a^{2}b^{2}+9b^{4}$
$7\sin b+\sqrt{23}=0$
$4x\le12$
$\left(7x^{\left(2\right)}\right)\left(-3xy\right)$
$x^4-6x^2+8x-3$
$3\left(5x-2\right)-8x-3x$
$19-8\left(-2\right)\left(-3\right)-\left(-23\right)$
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