推 lowpitch :當 x=-1, t=1 y=2 繞x=-1轉類似沙漏狀...大概吧... 06/05 19:15
→ sagu :還是毫無頭緒耶.. 06/06 12:56
A curve is defined by
{ 2
{ x = t - 2t;
{ 3 2
{ y = -t + 3t ;
Let R be the region enclosed by the loop of the curve. If R is totated about
the line x = -1, find the volume of the resulting solid.
V = ∫2πr(dr)h = 2π∫(x+1)(dx)2(y-2)
我想問黃色部分怎麼得出
如果可以的話 可以講詳細點
這邊都不太會轉
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