$${ x }^{ 2 } \times 2 { x }^{ 2 } -1$$
$8x^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{4}\times 2-1)$$
$$4\times 2x^{4-1}$$
$$8x^{4-1}$$
$$8x^{3}$$
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$2x^{4}-1$
$$x^{4}\times 2-1$$
