http://www.mapleprimes.com/posts/135076-An-Amusing-Derivative en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Tue, 09 Jun 2026 09:28:10 GMT Tue, 09 Jun 2026 09:28:10 GMT The latest comments added to the Post, An amusing derivative. http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/posts/135076-An-Amusing-Derivative http://www.mapleprimes.com/posts/135076-An-Amusing-Derivative?ref=Feed:MaplePrimes:An amusing derivative.:Comments#comment135088 <p>Mathematica 8.04 produces the same answer:<br>In[2]:=D[ArcCosh[x]*Sqrt[1 - x^2], x]<br><br>Out[2]=Sqrt[1 - x^2]/(Sqrt[-1 + x] Sqrt[1 + x]) - (x ArcCosh[x])/Sqrt[ 1 - x^2]</p> <p>I treat it as nit-picking.</p> The latest comments added to the Post, An amusing derivative. 135088 Wed, 13 Jun 2012 20:26:48 Z Markiyan Hirnyk Markiyan Hirnyk http://www.mapleprimes.com/posts/135076-An-Amusing-Derivative?ref=Feed:MaplePrimes:An amusing derivative.:Comments#comment135097 <p>In[3]:=D[ArcCosh[x]*Sqrt[1 - x^2], x, Reals]<br><br>Out[3]=0</p> <p>No comments.</p> The latest comments added to the Post, An amusing derivative. 135097 Thu, 14 Jun 2012 00:04:23 Z Markiyan Hirnyk Markiyan Hirnyk http://www.mapleprimes.com/posts/135076-An-Amusing-Derivative?ref=Feed:MaplePrimes:An amusing derivative.:Comments#comment135134 <p>In[1]:=D[Log[x], x, Reals]</p> <p>Out[1]= 0</p> <p>No comments.</p> <p>PS.</p> <p>In[2]:=Assuming[x \[Element] Reals, D[ArcCosh[x]*Sqrt[1 - x^2], x]]</p> <p>Out[2]=Sqrt[1 - x^2]/(Sqrt[-1 + x] Sqrt[1 + x]) - (x ArcCosh[x])/Sqrt[ 1 - x^2]</p> The latest comments added to the Post, An amusing derivative. 135134 Fri, 15 Jun 2012 09:48:47 Z Markiyan Hirnyk Markiyan Hirnyk