$-16-\left(-22\right)$
$0.8\cdot50$
$\left(4x+7\right)\left(-x-1\right)$
$\frac{d}{dr}\sqrt{b^2-r^2}+b$
$\frac{x}{1+\frac{1}{1+\frac{1}{x}}}$
$\sin\left(nx\right)+\sin\left(nx+2x\right)+\sin\left(nx+4x\right)$
$16+a^6-8a^3$
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