topic Re: &quot;simple&quot; derivation in Mathcad https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92572#M36601 <HTML><HEAD></HEAD><BODY><P>Thank you for the quick (and good) answer!</P></BODY></HTML> Tue, 05 Apr 2016 08:57:58 GMT mradspieler 2016-04-05T08:57:58Z "simple" derivation https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92570#M36599 Hi,I’m trying a simple derivation with mathcad 15. At least I thought it was easy.The function is I want Mathcad to calculate But the outcome is obviously missing a term…Check the attachment for the corresponding xmcd or png.Can somebody tell me what’s wrong?Michael Thu, 03 May 2018 14:34:12 GMT https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92570#M36599 mradspieler 2018-05-03T14:34:12Z Re: "simple" derivation https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92571#M36600 <HTML><HEAD></HEAD><BODY><P>&gt; Can somebody tell me what’s wrong?</P><P>Yes, Mathcad is often very (too) tolerant in this respect, but its wrong from a mathematical point of view to use the same variable for limit AND integration variable as you had done. Use different variables and all works OK.</P><P>Mathcads behavior nevertheless is wrong - it should throw an error message instead of yielding a wrong result.</P><P><IMG alt="" class="jive-image image-1" src="https://community.ptc.com/legacyfs/online/99988_pastedImage_0.png" style="max-width: 1200px; max-height: 900px;" /></P><P></P><P>WE</P></BODY></HTML> Mon, 04 Apr 2016 13:58:44 GMT https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92571#M36600 Werner_E 2016-04-04T13:58:44Z Re: "simple" derivation https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92572#M36601 <HTML><HEAD></HEAD><BODY><P>Thank you for the quick (and good) answer!</P></BODY></HTML> Tue, 05 Apr 2016 08:57:58 GMT https://www.ptcusercommunity.com/t5/Mathcad/quot-simple-quot-derivation/m-p/92572#M36601 mradspieler 2016-04-05T08:57:58Z