$-x^2-x+42$
$\sin\left(x-270\right)=\cos\left(x\right)$
$997-2004$
$\sqrt{5\sqrt{25}}$
$\frac{d}{dx}-4x^6+15x^3+12$
$f\left(x\right)=\:\sqrt{\frac{5}{x}}-\sqrt{\frac{4}{x}}$
$\left(-\frac{1}{8}x^2+2\right)^2$
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