Re: Inverse Tangent function

*To*: mathgroup at smc.vnet.net*Subject*: [mg80025] Re: Inverse Tangent function*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Fri, 10 Aug 2007 06:47:25 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <f9gtl1$a6d$1@smc.vnet.net>

Boen S. Liong wrote: > Let w1 = tan-1(x) i.e. inverse tangent of x or tan(w1) = x <snip> In Mathematica, the tangent function is written *Tan* and the inverse tangent function is *ArcTan*, so you would write w1 = ArcTan[x] or x = Tan[w1] (Note the /square/ brackets that enclose the argument list.) Also, you could have a look at some simplification function such as Simplify or TrigExpand as well as Solve and Reduce. -- Jean-Marc