# help with proofs

#### michaelmike121

##### New member
show that integral Upper limit 1 and lower limit 0 of dx/(1+e^x)(1+e^-x) is equal to 1/2tanh(1/2x)

#### Subhotosh Khan

##### Super Moderator
Staff member
show that integral Upper limit 1 and lower limit 0 of dx/(1+e^x)(1+e^-x) is equal to 1/2tanh(1/2x)
Hint: express tanh(x) as a function of e[SUP]x[/SUP].