[微積] ∫

[nadokaisshit (孔空)]

  pi/2             2           3      2
∫     [-8cos(t)sin (t) + 32cos (t)sin (t) ] dt
  0


       8
ans = ---
       5

不知該從何下手= =

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※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 1.161.68.217
推 herstein    :sin的微分是cos, cos^2+sin^2=1
推 suhorng     :cos^3(t) = cos(t)(1 - sin^2(t)), 令 u = sin(t)