>>33
I =η[0,3] 9sinƒΖcosƒΖdx
x=3‚“‚‰nƒΖ‚Ύ‚©‚ηdx/dƒΖ=3cosƒΖAx:0¨3‚ΕƒΖ:0¨ƒΞ/2
I =η[0,ƒΞ/2]9sinƒΖcosƒΖ* 3cosƒΖdƒΖ
= η[0,ƒΞ/2]27sinƒΖicosƒΖjO2dƒΖ
sinƒΖ=-(cosƒΖ)' ‚Ύ‚Ÿ‚η
= 27*[(-1/3)(cosƒΖ)^3] [0,ƒΞ/2]
=9

‚ΰ‚Ζ‚ΜŒ`‚Ε‚β‚ι‚Θ‚η
I = η[0,3] xγi9-xO2j ‚„‚˜
i9-xO2jOi3/2j = i3/2ji-2‚˜ji9-xO2jOi1/2j = -3xγ(9-x^2) ‚Ύ‚©‚η
”νΟ•ͺŠΦ”‚˜γ(9-x^2) ‚ΜŒ΄ŽnŠΦ”‚́i-1/3ji9-xO2jOi3/2j+C
‚±‚κ‚πF(x)‚Ζ‚·‚ι‚Ζ
I = F(3)-F(0) = 0+i1/3j*9Oi3/2j = i1/3j*27 = 9
ͺ‚Ύ‚Ζ’uŠ·‚Ή‚Έ‚Ι‚ΰ‚Ε‚«‚ι‚―‚ǁB