→ bibo9901 :分子分母同乘e^x, 然後令 u=e^x 04/14 21:33
→ Vulpix :u=e^x+e^(-x)比較方便一點^^ 04/14 21:41
→ riemannchen :感謝Vulpix大大 04/14 21:48
→ ttt95217 :轉成tanh(x)後查表 04/14 21:51
→ ttt95217 :或是換成-i*sin(ix)/cos(ix) 後硬微 04/14 21:55
→ kakashi45232:∫[g'(x)/g(x)]dx=ln|g(x)|+c 04/15 18:03
→ kakashi45232:∫tanhx dx=∫sinhx/coshx dx=∫1/coshx d(coshx) 04/15 18:06
→ kakashi45232:=ln|coshx|+c 04/15 18:07