cos(x°)=1 gives x = 3330 in CAS

mrahikka shared this problem 2 years ago
Not a Problem

If we solve (in CAS)

cos(x°)=1

and click solve numercally, we get x = 3330 in GeoGebra 5 and GeoGebra 6.

GeoGebra Graphing Calculator gives Undefined as a solution.

I guess this should be fixed.

Comments (3)

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what version?/5pkn+OF3XtP+kmYh6r2uQYiJF04AomoQMg6JpOBRNQoZB0TQciiYhw6BoGg5Fk5BhUDQNh6JJyDAomoZD0SRkGD8Au258ulQpAN4AAAAASUVORK5CYIIA

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The newest.

The equation is cos(x°) = 0, and you should click on Solve numerically button.

Sorry, my mistake on equation.

M

Files: cos.png
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my english is very bad

I think the help is enough explicit (cos(x°)=0,x=100) or (cos(x°)=0,x=200)


Note:

    If you don't give a starting point like a=3 or {x = 3, y = 1.5} the numerical algorithm may find it hard to find a solution (and giving a starting point doesn't guarantee that a solution will be found)
    The number of decimals depends on the choosen in global rounding.
    NSolve won't work for functions that are asymptotic to the x-axis or other extreme examples. They can often be reformulated though.

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