- #1

DryRun

Gold Member

- 838

- 4

**Homework Statement**

Find [tex]\int e^{-2x}\tanh x\,dx[/tex]

**The attempt at a solution**

[tex]\int e^{-2x}\tanh x\,dx

\\=\int e^{-2x}\times \frac{e^x-e^{-x}}{e^x+e^{-x}}\,dx

\\=\int \frac{e^{-x}-e^{-3x}}{e^x+e^{-x}}\,dx

[/tex]

Then i have no idea how to proceed.