Re: [考古] 交大90年
※ 引述《hotdave (暫)》之銘言:
: find the "area of the surface" obtained by rotating the curve y=sinx,
: 0<=x<=pi,about the x-axis
:
π
∫2πsinx√1+(cosx)^2 dx
0
= -π[ln(cosx+√1+(cosx)^2)+cosx√1+(cosx)^2] π、0代入
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