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**Hannibal lecter****Member**- Registered: 2016-02-11
- Posts: 225
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Hi,

prove :-

tanh(x + y) = (tanh x + tanh y)/(1 + tanh x + tanh y)

Wisdom is a tree which grows in the heart and fruits on the tongue

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,422

Hi

Do you have formulas for sinh(x + y) and cosh(x+y) ?

If yes, use tanh = sinh / cosh

Or go back to definitions in terms of "e"

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you!

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