Bug in article 893? (HP 35s Triangle solver)

[Dave Britten]

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