$$C93+72\times6+10$$
$C_{93}+442$
$$C_{93}+432+10$$
$$C_{93}+442$$
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$1$
$$\frac{\mathrm{d}}{\mathrm{d}C_{93}}(C_{93}+432+10)$$
$$\frac{\mathrm{d}}{\mathrm{d}C_{93}}(C_{93}+442)$$
$$C_{93}^{1-1}$$
$$C_{93}^{0}$$
$$1$$