nguyen ham ,,,giup minh voi

L

lpingku

(1 + 2*e^x ) ' =2*e^x
--> nguyen ham. ..=nguyenham (1+2*e^x)dx/2*(1+2*e^x) = (ln(1+2*e^x))/2
 
N

namnguyen_94

[TEX]I = \int \frac{e^x}{1+2.e^x}dx = \frac{1}{2}\int \frac{d(2.e^x+1)}{2.e^x+1} = \frac{ln(2e^x+1)}{2}[/TEX]
 
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