# Thread: Hyperbolic trig identity for tanh (2x) using exponential definitions

1. ## Hyperbolic trig identity for tanh (2x) using exponential definitions

Hey,

Using exponential definitions, show that

tanh(2x)= (2tanh(x))/(1+tanh^2(x))

Please help. Thanks

2. Originally Posted by defcon3
Hey,

Using exponential definitions, show that

tanh(2x)= (2tanh(x))/(1+tanh^2(x))

Please help. Thanks
Start by writing down the exponential form for $\tanh(2x)$ then do the same for the right hand side. Now simplify what you have for the right hand side and with luck you will find that it is the same as you had for $\tanh(2x)$.

So try this and report back if you get stuck.

CB

3. its alrite i got it.. thanks alot