$$u^{7}-3u^{6}+4u^{2}+2-u^{6}-4-4$$
$u^{7}-4u^{6}+4u^{2}-6$
$$u^{7}-4u^{6}+4u^{2}+2-4-4$$
$$u^{7}-4u^{6}+4u^{2}-2-4$$
$$u^{7}-4u^{6}+4u^{2}-6$$
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$u\left(7u^{5}-24u^{4}+8\right)$
$$\frac{\mathrm{d}}{\mathrm{d}u}(u^{7}-4u^{6}+4u^{2}+2-4-4)$$
$$\frac{\mathrm{d}}{\mathrm{d}u}(u^{7}-4u^{6}+4u^{2}-2-4)$$
$$\frac{\mathrm{d}}{\mathrm{d}u}(u^{7}-4u^{6}+4u^{2}-6)$$
$$7u^{7-1}+6\left(-4\right)u^{6-1}+2\times 4u^{2-1}$$
$$7u^{6}+6\left(-4\right)u^{6-1}+2\times 4u^{2-1}$$
$$7u^{6}-24u^{6-1}+2\times 4u^{2-1}$$
$$7u^{6}-24u^{5}+2\times 4u^{2-1}$$
$$7u^{6}-24u^{5}+8u^{2-1}$$
$$7u^{6}-24u^{5}+8u^{1}$$
$$7u^{6}-24u^{5}+8u$$
