$\frac{d^2}{dx^2}\left(1-x^2\right)$
$y=x\sqrt{16-x}^2+16arc\sin\left(\frac{x}{4}\right)$
$b^4.b^2.2b$
$23x-6x+3x-14y+6y$
$\left(2mn-7\right)\left(2mn+7\right)$
$7x^2-126x+81$
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