Bug in article 893? (HP 35s Triangle solver) « Next Oldest | Next Newest »

 ▼ Dave Britten Member Posts: 247 Threads: 26 Joined: Oct 2007 05-13-2009, 09:09 PM In article 893, there's a rather nice triangle solver, though I think there's an error in the calculation of the 2nd SSA solution (menu option 6). Observe this bit of code: ```T096 CF 10 T097 EQN ASIN(S/R*SIN(U)) T098 STO V T099 EQN ACOS(-COS(U+V)) T100 STO W T101 FS? 1 T102 GTO T084 T103 EQN ACOS(1)-W T104 STO W T105 GTO T084 ``` I see two problems with this. First, ACOS(1) is always zero, so W (angle 3) is just negated, whereas it should be replaced with its supplement(ACOS(-1)-W). The second problem is that it's actually angle 2 (V) that needs to be replaced with its supplement, not angle 3 (W). I've made the following changes. Anybody care to confirm that this makes sense? It looks like I'm getting the correct results now. ```T096 CF 10 T097 EQN ASIN(S/R*SIN(U)) T098 STO V T099 FS? 1 T100 GTO T103 T101 EQN ACOS(-1)-V T102 STO V T103 EQN ACOS(-COS(U+V)) T104 STO W T105 GTO T084 ``` -Dave

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