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(a) y'=5(x+5)⁴, y"=20(x+5)³, y'''=60(x+5)²

(b) y'=(4x+4-4x)/(x+1)²=4(x+1)⁻², y"=-8(x+1)⁻³=-8/(x+1)³, y'''=24(x+1)⁻⁴=24/(x+1)⁴

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