Why not!? Can you show the symbolic solution?

[ValeryOchkov]

I show to my sdudents the equations sin a + sin a = tan a

99% say that it is not correct? But 1%...

See please

[ValeryOchkov]

nd what about Mathcad/MuPAD

[ValeryOchkov]

[LucMeekes]

Your text "sin(a)+sin(a)=tan(a)" shows different from you mathcad sheet picture.

Because it's more intrigueing I tried the latter first:

Note that there are four primary solutions to this problem. (see the float results). I expanded the smallest real solution up to 2 of 5 pages..

I guess the size is the reason why Prime will not give you the symbolic result...?

Success!
Luc

[Werner_E]

In Mathcad 15 all symbolic results are equally wide ("only" three page widths). Using the modifier "simplify,max" the result gets four pages width.

[ValeryOchkov]

OK!

What about the second "bug": 30deg+30deg+30deg=180deg?

[Werner_E]

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@ValeryOchkov wrote:

OK!

What about the second "bug": 30deg+30deg+30deg=180deg?

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What exactly do you expect?

[ValeryOchkov]

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@Werner_E wrote:

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@ValeryOchkov wrote:

OK!

What about the second "bug": 30deg+30deg+30deg=180deg?

---

What exactly do you expect?

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See please https://en.wikipedia.org/wiki/Nikolai_Lobachevsky and Mathcad-sheet in attach

[Werner_E]

So I guess the picture you posted in your initial post does not show a bug or failure - it shows a hyperbolic triangle with three 30° angles (with a defect of pi/2).

The failure or bug is not the picture but your assumption that the angles would add up to 180° (which the angles in a hyperbolic triangle never do and which is not claimed in the picture) 😉

BTW, the picture is a stock picture and sells with different persons in different poses:

https://www.fotosearch.at/CSP992/k13871567/

https://www.meinekurse24.de/koln-nachhilfe-physik-mathematik-physik-mathe-nachhilfe-fur-schuler-und-studenten-611.html

https://de.123rf.com/photo_23371847_handsome-young-school-boy-denken-%C3%BCber-komplexe-mathematische-zeichen.html

https://de.123rf.com/photo_30762132_sch%C3%B6ne-junge-schulm%C3%A4dchen-denken-%C3%BCber-komplexe-mathematische-zeichen.html

https://de.123rf.com/photo_19124410_sch%C3%B6ne-junge-schulm%C3%A4dchen-denken-%C3%BCber-komplexe-mathematische-zeichen.html

Its a long time since the artist went to school and learned math.