$$2X(\frac{1}{2}\times\frac{1}{4}^{2})$$
$\frac{X}{16}$
$$X\times \left(\frac{1}{4}\right)^{2}$$
$$X\times \frac{1}{16}$$
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$\frac{1}{16} = 0.0625$
$$\frac{\mathrm{d}}{\mathrm{d}X}(X\times \left(\frac{1}{4}\right)^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(X\times \frac{1}{16})$$
$$\frac{1}{16}X^{1-1}$$
$$\frac{1}{16}X^{0}$$
$$\frac{1}{16}\times 1$$
$$\frac{1}{16}$$