这道不定积分答案是多少？
\u8fd9\u9053\u4e0d\u5b9a\u79ef\u5206\u7684\u7b54\u6848\u5230\u5e95\u662f\u591a\u5c11\uff1f\u9ebb\u70e6\u7ed9\u51fa\u8fc7\u7a0b\uff01\u4f60\u7684\u7b54\u6848\u4e0e\u79ef\u5206\u8868\u7684\u7b54\u6848\u90fd\u662f\u6b63\u786e\u7684\uff0c\u7b54\u6848\u53ef\u4ee5\u6709\u591a\u79cd\u5f62\u5f0f\uff0c\u53ef\u4ee5\u81ea\u5df1\u6c42\u4e00\u4e0b\u5bfc\u6570\u6765\u9a8c\u8bc1\uff0c\u4e0d\u5fc5\u53bb\u548c\u7b54\u6848\u5bf9\u7167\u3002\u8bf7\u91c7\u7eb3\uff0c\u8c22\u8c22\uff01
按照定积分的几何意义是上半圆。
可以设 t=2sint，三角换元
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