Results 1 to 7 of 7

Math Help - Solving for angle problems

  1. #1
    Newbie
    Joined
    Apr 2009
    Posts
    4

    Solving for angle problems

    Hello all,
    I just started having a problem with my TI-89 titanium. Wondering if any of you can help me out. Whenever I try and solve for an angle it gives me some funky answers, I don't get it. I've been through my mode pletty of times trying to figure it out. Okay here are a couple examples of what I'm getting.
    input -> solve(tan(x)=1,x) ans-> x=45*(4*@n22+1)
    input -> solve(sin(x)=.5,x) ans-> x=360*(@n21(pi)=1.308997)/(pi) or x=360*(@n21(pi)=.2617994)/(pi)

    I don't have anything stored for x. If i input x , then enter I get x as the result.

    Please HELP!!! Thank you!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by rex121 View Post
    Hello all,
    I just started having a problem with my TI-89 titanium. Wondering if any of you can help me out. Whenever I try and solve for an angle it gives me some funky answers, I don't get it. I've been through my mode pletty of times trying to figure it out. Okay here are a couple examples of what I'm getting.
    input -> solve(tan(x)=1,x) ans-> x=45*(4*@n22+1)
    input -> solve(sin(x)=.5,x) ans-> x=360*(@n21(pi)=1.308997)/(pi) or x=360*(@n21(pi)=.2617994)/(pi)

    I don't have anything stored for x. If i input x , then enter I get x as the result.

    Please HELP!!! Thank you!
    What's your question? You're calculator is giving you the general solution to the equations you've asked it to solve. @n22 etc. are parameters and represent the set of integers.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2009
    Posts
    4
    How do I turn those parameters off?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by rex121 View Post
    How do I turn those parameters off?
    You can't, because they are part of the answer. If you don't want them, then you need to tell your calculator to solve the equations over a given domain eg. [0, 2pi]. Then you will get numbers, no parameters.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Apr 2009
    Posts
    4
    It just started doing this... It has never done this before. It has a count going on in that answer. Each time the end half dislplays some type of (4*@n22+1) then next time would be (4*@n23+1), then (4*@n24+1) and so on. I've had this calculator for almost a year and I promise this is not normal.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Apr 2009
    Posts
    4
    Here is another example: On page 255 of my manual it shows input ->
    solve(tan(x)=1/x,x)|x>0andx<1 output -> x=.860...
    when I input this exact equation into my calculator I get x= 3.42562 or x = 6.4373 or 59.707
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by rex121 View Post
    It just started doing this... It has never done this before. It has a count going on in that answer. Each time the end half dislplays some type of (4*@n22+1) then next time would be (4*@n23+1), then (4*@n24+1) and so on. I've had this calculator for almost a year and I promise this is not normal.
    The parameter increments by 1 every time it is used (to distinguish it from the previous parameters).

    Quote Originally Posted by rex121 View Post
    Here is another example: On page 255 of my manual it shows input ->
    solve(tan(x)=1/x,x)|x>0andx<1 output -> x=.860...
    when I input this exact equation into my calculator I get x= 3.42562 or x = 6.4373 or 59.707
    The equation you solved above is over a fininte domain and there is a finite number of solutions. The calculator can tell you each one. In the previous examples you were solving over an infinite domain and there were an infinite number of solutions, these solutions are represented using a parameter.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Need help with Angle Problems
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 26th 2010, 04:40 PM
  2. Solving For x (angle)
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: July 29th 2009, 01:32 AM
  3. More double angle and Half angle problems
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: July 21st 2009, 06:54 PM
  4. 2 quick sin/cos problems, solving for an angle
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: December 16th 2008, 02:44 AM
  5. Replies: 2
    Last Post: February 15th 2007, 10:16 PM

Search Tags


/mathhelpforum @mathhelpforum