find the indicated derivative. d/du (8u^0.1-3u^1.3)
d/du (8u^0.1-3u^1.3)
= 8 * d/du (u0.1) - 3 * d/du (u1.3)
= 8 * 0.1 * u0.1 - 1 - 3 * 1.3 * u1.3 - 1
= 0.8 u-0.9 - 3.9 u0.3
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