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Casio FX-115MS bug
11-24-2018, 08:28 PM (This post was last modified: 11-24-2018 08:31 PM by ijabbott.)
Post: #13
RE: Casio FX-115MS bug
(11-24-2018 07:25 PM)Albert Chan Wrote:  Solving cubic with hyperbolic sine formula, discovered Casio FX-115MS asinh bug
(asinh bug also hit my Casio FX-3650P ...)

Solve X³ + 11 X - 1000100 = 0 for X, using formula X = -2 √(r) sinh(1/3 * asinh(s/r^1.5))

asinh(s/r^1.5)) = asinh(-500050/(11/3)^1.5) = asinh(-71220.70789) = -11.86817286 ???

Even my pocket Casio FX-260Solar get this right, asinh(-71220.70789) = -11.86668608

Even the TI-35X and TI-36X SOLAR manage to get this one correct, although this parameter is too large to be affected by the Texas Instruments Logarithm Bug. (They are nice calculators, especially the versions with the rubber keys, but it's a shame about this bug.)

— Ian Abbott
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Messages In This Thread
Casio FX-115MS bug - Albert Chan - 10-31-2018, 07:02 PM
RE: Casio FX-115MS bug - klesl - 11-01-2018, 11:14 AM
RE: Casio FX-115MS bug - ijabbott - 11-01-2018, 08:16 PM
RE: Casio FX-115MS bug - G. Cook - 11-02-2018, 09:14 PM
RE: Casio FX-115MS bug - Albert Chan - 11-03-2018, 02:41 PM
RE: Casio FX-115MS bug - Albert Chan - 11-05-2018, 08:58 PM
RE: Casio FX-115MS bug - Albert Chan - 11-07-2018, 08:15 PM
RE: Casio FX-115MS bug - Albert Chan - 11-07-2018, 10:47 PM
RE: Casio FX-115MS bug - Albert Chan - 11-08-2018, 04:17 PM
RE: Casio FX-115MS bug - Albert Chan - 11-24-2018, 07:25 PM
RE: Casio FX-115MS bug - ijabbott - 11-24-2018 08:28 PM
RE: Casio FX-115MS bug - klesl - 11-07-2018, 08:33 PM
RE: Casio FX-115MS bug - Albert Chan - 11-08-2018, 02:51 PM
RE: Casio FX-115MS bug - brickviking - 11-28-2018, 01:01 AM



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