$${ 289 }^{ 2 } x { 9 }^{ 2 }$$
$6765201x$
$$83521x\times 9^{2}$$
$$83521x\times 81$$
$$6765201x$$
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$6765201$
$$\frac{\mathrm{d}}{\mathrm{d}x}(83521x\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(83521x\times 81)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(6765201x)$$
$$6765201x^{1-1}$$
$$6765201x^{0}$$
$$6765201\times 1$$
$$6765201$$