$\lim_{x\to2}\left(\frac{1}{2}x\right)+\left(\frac{1}{x+1}\right)$
$\frac{x^2+8x+16}{x+4}$
$\:1.4x^4-8x^3+12x^2$
$28-2m;\:m=7$
$\left(x^2+\frac{y}{x}\right)dx+\left(\ln\left(x\right)+2y\right)dy=0$
$\left[5+4\left(2-7\right)+3\right]+6\left(4+3\right)$
$\sin\left(\arctan\left(6x\right)-\arccos\left(x\right)\right)$
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