$2x^2-8x+3$
$\frac{2}{2\pi}\int_{-\pi}^0\left(-\frac{x^2}{2}\right)dx$
$2x^{-3}$
$2r+\left(t+r\right)$
$\frac{6.92}{x\sqrt{x^2+144}}$
$\sin\:\left(2a\right)\cdot\:\cos\:\left(2a\right)$
$\left(2^{-a}-x^{-0.333a}\right)^2$
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