$$\frac { 98 c m ^ { 2 } \cdot 6 m ^ { 2 } } { 98 c m ^ { 2 } \cdot 6 m ^ { 2 } \cdot 12 c }$$
$\frac{1}{12c}$
$$\frac{98cm^{4}\times 6}{98cm^{2}\times 6m^{2}\times 12c}$$
$$\frac{98cm^{4}\times 6}{98c^{2}m^{2}\times 6m^{2}\times 12}$$
$$\frac{98cm^{4}\times 6}{98c^{2}m^{4}\times 6\times 12}$$
$$\frac{1}{12c}$$
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$-\frac{1}{12c^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}c}(\frac{588m^{4}}{7056cm^{4}}c^{1-1})$$
$$\frac{\mathrm{d}}{\mathrm{d}c}(\frac{1}{12c}c^{0})$$
$$\frac{\mathrm{d}}{\mathrm{d}c}(\frac{1}{12c})$$
$$0$$
