[積分] 到底錯在哪
3 3
x=cost y=sint t=0到2(PI)
求長度
為什麼我算的兩種算法
(PI)/2 2(PI)
4 S 不等於 S
0 0
.....
.....
(PI)/2
=4 * 3/2(sint)^2 |
0
=6(1)=6
.......
2(PI)
=3/2(sint)^2 |
0
=0
第一個答案對
但我想不到第二種方法錯在哪
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