$$a \cdot ( 2 ^ { 13 } \times 5 ^ { 12 } ) \div ( 10 ) ^ { 12 }$$
$2a$
$$\frac{a\times 8192\times 5^{12}}{10^{12}}$$
$$\frac{a\times 8192\times 244140625}{10^{12}}$$
$$\frac{a\times 2000000000000}{10^{12}}$$
$$\frac{a\times 2000000000000}{1000000000000}$$
$$a\times 2$$
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$2$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{a\times 8192\times 5^{12}}{10^{12}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{a\times 8192\times 244140625}{10^{12}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{a\times 2000000000000}{10^{12}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{a\times 2000000000000}{1000000000000})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(a\times 2)$$
$$2a^{1-1}$$
$$2a^{0}$$
$$2\times 1$$
$$2$$
