$$2X(\frac{1}{2}\times\frac{2}{4})$$
$\frac{X}{2}$
$$X\times \frac{2}{4}$$
$$X\times \frac{1}{2}$$
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$\frac{1}{2} = 0.5$
$$\frac{\mathrm{d}}{\mathrm{d}X}(X\times \frac{2}{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(X\times \frac{1}{2})$$
$$\frac{1}{2}X^{1-1}$$
$$\frac{1}{2}X^{0}$$
$$\frac{1}{2}\times 1$$
$$\frac{1}{2}$$
