As the title shows, I want to do they hyperbolic tan of a complex number, using my calculator (casio fx100ms) but I keep getting a maths error, whether I do it using the tanh function or if I try the (1-e^(-2x))/(1+e^(-2x)) Any help would be awesome. Thanks.
I think your calculator manual says that the calculator doesn't support the complex number coefficient mode for hyperbolic sinh, cosh, tanh and other select functions. http://www.google.com/url?sa=t&rct=...ttcjO3x9gBVXwPw&bvm=bv.69411363,d.cWc&cad=rja
Nooooo :(, thanks for looking into it mate, I thought it was just something I was doing wrong. Is there any way I can do it normally? like any way I can do it say like the hard way?
Use google, in the search box enter tanh(5i) as an example and google calculator will show the answer - 3.38051501 i
Dang calculators only support real numbers! (Well, most of 'em anyways) Tanh(z) can be evaluated by using the definition of the tanh function with complex argument z, tanh(z) = sinh(z) / cosh(z) = [itex]\frac{e^{z}-e^{-z}}{e^z+e^{-z}}[/itex] which is not as easy to calculate as it looks. See: http://www.uni-graz.at/imawww/vqm/pages/complex/12_tanh.html You can always use Wolfram Alpha to calculate a tanh(z) for a specific value of z
Thanks mate, its actually on my formula sheet on my exam I got to take tomorrow, but if thats the case I really don't think I will be able to use it with only my calculator itself. Cheers though.
Perhaps you should ask your teacher about it before the exam. You might need a better calculator TI-83 ??? but not sure if it has the same limit or not. CORRECTION: http://tibasicdev.wikidot.com/tanh TI caclculator doesn't support complex numbers with tanh either.