0.5
1.0
1.5
2.0
Correct answer is B
x3−1x2≡x−1x2=x−x−2
∫21(x−x−2)dx=(x22+1x)|21
= (222+12)−(122+11)
= (2+12)−(12+1)
= 212−112
= 1.0
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