Answers
觀察:d/dx ( x²+2x-2 ) = 2x+2 = 2(x+1)
可知 d/dx (x²+2x-2)³ = 3(x²+2x-2)² · 2(x+1)
所以 ∫₀¹ (x+1)(x²+2x-2) dx = (x²+2x-2)³/6 |₀¹
= 1/6 - (-8/6)
= 9/6
= 3/2
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