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## Homework Statement

A water wave has length L moves with velocity V across body of water with depth d, then v^2=gL/2pi•tanh(2pi•d/L)

A) if water is deep, show that v^2~(gL/2pi)^1/2

B) if shallow use maclairin series for tanh to show v~(gd)^1/2

## Homework Equations

Up above

**3. The Attempt at a Solution**

Have no idea where to start, just looking for some tips and I'm assuming I need the tanh series for both parts, this has been the hardest calculus for me

Have no idea where to start, just looking for some tips and I'm assuming I need the tanh series for both parts, this has been the hardest calculus for me