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有幾題不太會.. 3.Solve the differential equation dy/dx+ytanx = secx 6.The region bounded by y=cosx 0<=x<=pi/2 and the line y=k 0<=k<=1 is reolved about the line y=k generating a solid S.Determine k so the S has (a)mximum volume and (b)minimum volume 7.find the value of the constant C for which the integral 無限大 x C S ( ----- - -----)dx 0 x^2+1 3x+1 converges.Evaluate the integral for this value of C 8.Find the maximum and minimum values of z=y^2-x^2 on the set bounded by the closed triangle with vertices (0,0) (1,2)and(2,-2) 麻煩大家了@@中興後天就要考了Q____Q -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.195.15.89 ※ 編輯: gn02335338 來自: 123.195.15.89 (07/07 19:56)