[積分]
∫(secx/ln1secx+tanx1)dx
=∫(secx/ln1secx+tanx1)dx(secx+tanx/secx+tanx)
=∫d(secx+tanx)/(ln1secx+tanx1)(secx+tanx)
=㏒ (secx+tanx) +c
(secx+tanx)
請問我這樣哪裡錯?
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