$$\sqrt{16}x^{4}\sqrt{4}x^{6}$$
$8x^{10}$
$$\sqrt{16}x^{10}\sqrt{4}$$
$$\sqrt{4}\sqrt{4}x^{10}\sqrt{4}$$
$$4x^{10}\sqrt{4}$$
$$4x^{10}\times 2$$
$$8x^{10}$$
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$80x^{9}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\sqrt{16}x^{10}\sqrt{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\sqrt{4}\sqrt{4}x^{10}\sqrt{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(4x^{10}\sqrt{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(4x^{10}\times 2)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(8x^{10})$$
$$10\times 8x^{10-1}$$
$$80x^{10-1}$$
$$80x^{9}$$
