$$( d ) 1567 \times 998$$
$1563866$
$$\frac{\mathrm{d}}{\mathrm{d}d}(d\times 1563866)$$
$$1563866d^{1-1}$$
$$1563866d^{0}$$
$$1563866\times 1$$
$$1563866$$
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$1563866d$
$$d\times 1563866$$