1.

Evaluate:\(\int\cfrac{e^x}{(e^{2x}+1)}dx\) ∫ ex/(e2x+1)

Answer»

To find: \(\int\cfrac{e^x}{(e^{2x}+1)}dx\)

Formula Used: \(\int\cfrac{dx}{1+x^2}=tan^{-1}x\)

Let y = ex … (1) 

Differentiating both sides, we get '

dy = ex dx 

Substituting in given equation,

\(\Rightarrow\) \(\int\cfrac{dy}{y^2+1}\)

⇒ tan-1 y

From (1), 

⇒ tan-1 (ex ) 

Therefore,

\(\int\cfrac{e^x}{(e^{2x}+1)}dx=tan^{-1}(e^x)+c\)



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