Explanation: 
Another Explanation (5):
সমাধান:
আমরা নির্ণয় করতে চাই: ∫ dx/(ex+e-x)
এখানে,
∫ dx/(ex+e-x) = ∫ dx/(ex+1/ex)
= ∫ ex dx/(e2x+1)
এখন, ধরি ex = t ⇒ ex dx = dt
সুতরাং,
∫ ex dx/(e2x+1) = ∫ dt/(t2+1)
= tan-1(t) + c [∵ ∫ dx/(x2+1) = tan-1(x) + c]
= tan-1(ex) + c
অতএব, ∫ dx/(ex+e-x) = tan-1(ex) + c 🥳