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主要内容

极坐标曲线所围面积介绍

问题

R为极坐标曲线包围的区域:r, left parenthesis, theta, right parenthesis, equals, 2, minus, 2, cosine, left parenthesis, theta, right parenthesisstart fraction, 2, pi, divided by, 3, end fraction, is less than or equal to, theta, is less than or equal to, pi
下列哪个积分能计算出R的面积?
选出正确答案:
阴影部分的
不会做了?
不会做了?