$$2x(5x)+1$$
$10x^{2}+1$
$$2x^{2}\times 5+1$$
$$10x^{2}+1$$
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$20x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(2x^{2}\times 5+1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(10x^{2}+1)$$
$$2\times 10x^{2-1}$$
$$20x^{2-1}$$
$$20x^{1}$$
$$20x$$
