Re: Different answers in mathematica and my calculator.

*To*: mathgroup at smc.vnet.net*Subject*: [mg125595] Re: Different answers in mathematica and my calculator.*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Tue, 20 Mar 2012 02:23:20 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201203191000.FAA01033@smc.vnet.net>

See tutorial/FunctionsThatDoNotHaveUniqueValues (or http://reference.wolfram.com/mathematica/tutorial/FunctionsThatDoNotHaveUniqueValues.html ) x == 4/(3 (-1)^(1/3)); This is a solution to #^3 & /@ % x^3 == -(64/27) Solve[%] {{x -> -(4/3)}, {x -> 2/3 (1 - I Sqrt[3])}, {x -> 2/3 (1 + I Sqrt[3])}} -4/3 (-1)^(2/3) == 2 (1 - I Sqrt[3])/3 // Simplify True Solve[x^3 == -64/27, x, Reals] {{x -> -(4/3)}} Bob Hanlon On Mon, Mar 19, 2012 at 6:00 AM, Nile <thrasher300 at gmail.com> wrote: > 4/(3Power[2(-2)+3, (3)^-1]) > > I get -(4/3) (-1)^(2/3) in Mathematica but only -4/3 on my calculator. > > > N[Sec[8/(8 Sqrt[2])]]/Degree to get Cos^-1 of 8/(8 Sqrt[2]) and it gives me 75 deg instead of 45... > > I'm not sure what I'm doing wrong, I tried in Wolfram Alpha and it gives me the same thing. > > Thank you. > > -Francis >

**References**:**Different answers in mathematica and my calculator.***From:*Nile <thrasher300@gmail.com>