$x^2-9x-18$
$8+0\cdot0$
$\sin\left(x+b\right)+\sin\left(x-b\right)=2\sin\left(x\right)\cos\left(b\right)$
$\left(\frac{8x^3y^{-2}x^4}{4x^{-2}y^4z^{-3}}\right)^{-2}$
$36x^2-6x-12$
$\left(+7\right)-\left(-5\right)$
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