<![CDATA[Domain of freehand shape]]>
https://help.geogebra.org/topic/domain-of-freehand-shape
Sun, 28 Feb 2016 17:12:21 +0000Sun, 28 Feb 2016 09:58:10 +0000Zend_Feed<![CDATA[obviously not: log(x) and log(|x|) have differents domain ; domain(f) and domain(|f|) are the same try if[isdefined[f(x)],f(abs(x))]]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190559
Sun, 28 Feb 2016 10:10:14 +0000<![CDATA[i tried isdefined and it does not work fine try if[f(x)==f(x),f(abs(x))] it is my old vdersion of isdefined ]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190563
Sun, 28 Feb 2016 11:34:36 +0000<![CDATA[I'm trying to work out how to tell my students that the answer they have given, which is the same as GeoGebra, is not the answer given by the exam board (it's a UK A Level (pre-university) question.) Reading the question again, I think it is ambiguous! Thanks for your solution, mathmagic - although I don't quite follow the syntax!)]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190573
Sun, 28 Feb 2016 14:10:29 +0000<![CDATA[Hi, gof (x) is defined <=> f(x) is defined and y=f(x) is a number that g(y) is defined. In this case, f(x)=abs(x) is defined for all real and with y=abs(x), f(y) is defined when x or -x is in domain(f) so for me, GeoGebra is right. For the syntax : f(x)==f(x) seems a boolean function true when f(x) is defined and false if not,. If[<boolean function>,<function>] seems the function with the domain where <boolean function>==true Cheers.]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190591
Sun, 28 Feb 2016 16:16:35 +0000<![CDATA[Where's the question from (Exam board / paper / year)?]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190593
Sun, 28 Feb 2016 16:18:14 +0000<![CDATA[Edexcel C3 Jan 2008 - no mention of domain in question, mark scheme or examiners' report, only implication in answer that it is restricted.]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190595
Sun, 28 Feb 2016 16:28:26 +0000<![CDATA[Mark scheme says "For the purpose of marking this paper, the graph is identical to (a)" which is not very helpful for students (but it is a mark scheme, not a model answer :) ) This is correct (as is GeoGebra :) ) https://www.youtube.com/wat...]]>
https://help.geogebra.org/topic/domain-of-freehand-shape#comment-190599
Sun, 28 Feb 2016 17:12:21 +0000