$\lim_{b\to a}\left(\frac{1-e^{\left(-\frac{1}{a}-\frac{1}{b}\right)w}}{a+b}\right)$
$\lim_{x\to0}\left(\frac{\left(2\right)^x}{x^2+1}\right)$
$8 x ^ { 3 } + 4 x ^ { 2 } + 2 x - 4$
$\left(-1.7\right)+1.2$
$x^3+3x^2+3x+2$
$x^2+3x+2x+6$
$y'\:=\sqrt{1-y^2}$
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