$$(3a^{-5})(2a^{0})$$
$\frac{6}{a^{5}}$
$$3a^{-5}\times 2$$
$$6a^{-5}$$
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$-\frac{30}{a^{6}}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(3a^{-5}\times 2)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(6a^{-5})$$
$$-5\times 6a^{-5-1}$$
$$-30a^{-5-1}$$
$$-30a^{-6}$$
