$\sin\left(3x\right).\cos\left(8x\right)$
$\lim_{x\to\infty}\left(\frac{x+e^{2x}}{2xe^{2x}-e^{2x}}\right)$
$x^3-2^2+5x+6$
$-2.5\left(1.4+3.1\right)+6.9\left(-4.3\right)$
$\left(1-x\right)+5c\left(1-x\right)$
$\left(42a-6\right)+\left(\frac{2}{3}\right)$
$2x^2+5x+1=0$
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