大学的吧?可以用积分么?
第一步：求曲线与x轴的交点坐标为（—1,0）和（1,0）,画出图形,判断出所求面积是位于y轴下方的弓星面积；
第二步：对y=x^2-1积分,上下限为—1到1（注：原函数为(x^3/3-x）代入上下限,做差即可求)；
第三步：积分结果为—4/3,但是所求面积为正数,于是答案为4/3.
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