Talk:Gudermannian function

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[edit] Inverse gd = arcgd

Since the Gudermannian function is a trig function, it would follow that its inverse is an arc function, therefore \operatorname{arcgd}(x)={\rm gd}^{-1}(x)\, should be a valid notation.  ~Kaimbridge~ 13:37, 23 February 2006 (UTC)