Solving a trigonometric equation

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Solving a trigonometric equation - wrong results?

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coeur_de_lion		#1 Posted : 13 March 2020 23:15:53(UTC)
Rank: Member Groups: Registered Joined: 28/09/2014(UTC) Posts: 18		Dear all, I try to solve a simple trigonometric equation with "solve", but I don't find results in some situation and I don't understand why. SINE.sm (9kb) downloaded 12 time(s). Any help is appreciated. Thank to all


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Jean Giraud		#2 Posted : 14 March 2020 01:00:50(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Three things here: 1. All maths fncts are Padé rational fraction. on small range of the argument, then processed for extending. 21 floating 18 considered trues conserved 15 [standard tables]. 2. '0' is undefined generally. 3. 5*π doctored solve bloc is not fool proof all/any applications SINE.sm (12kb) downloaded 17 time(s).

1 user thanked Jean Giraud for this useful post.		on 17/03/2020(UTC)
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Jean Giraud		#3 Posted : 14 March 2020 14:27:49(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		... sanity check from Casio on line calculator.

1 user thanked Jean Giraud for this useful post.		on 17/03/2020(UTC)
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coeur_de_lion		#4 Posted : 17 March 2020 08:31:41(UTC)
Rank: Member Groups: Registered Joined: 28/09/2014(UTC) Posts: 18		Dear Jean, thank you for the answers. To be sure if I understand right: the mistakes are from the approximation of the functions. I apoligize, but I don't understand your "sanity check". Could you explain a little bit? Thank you


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Jean Giraud		#5 Posted : 17 March 2020 15:45:18(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: coeur_de_lion Dear Jean, thank you for the answers. To be sure if I understand right: the mistakes are from the approximation of the functions. I apoligize, but I don't understand your "sanity check". Could you explain a little bit? Thank you Often, in advanced works, we have to check [sanity check] results. Casio [Keisan] on line calculator(sss..] is Bible. As the matter example was Bessel: here is the document. Link to Bessel-Keisan in turquoise. Cheers ... Jean. Bessel JY.sm (86kb) downloaded 19 time(s).


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