$$x \times x \times 2$$
$4x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{2}\times 2)$$
$$2\times 2x^{2-1}$$
$$4x^{2-1}$$
$$4x^{1}$$
$$4x$$
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$2x^{2}$
$$x^{2}\times 2$$
