$$3C2 \times 0.125$$
$0.375$
$$\frac{\mathrm{d}}{\mathrm{d}C_{2}}(0.375C_{2})$$
$$0.375C_{2}^{1-1}$$
$$0.375C_{2}^{0}$$
$$0.375\times 1$$
$$0.375$$
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$\frac{3C_{2}}{8}$
$$0.375C_{2}$$