Results 1 to 2 of 2

Math Help - using TI-83 to sovle angle between two vectors question...

  1. #1
    Junior Member
    Joined
    Feb 2011
    From
    Canada
    Posts
    27

    using TI-83 to sovle angle between two vectors question...

    So I'm following along in my book where it comes to put the final values in the equation:


    cosO=u*v/|u|*|v|

    = -1/sqrt 6 (5)

    and I should get -0.14 But I'm not getting it?

    am I inputting it into the calculator the wrong way?

    I use cos^-1(-1/sqrt 6 (5)) but I get 1.85 and not -0.14
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,804
    Thanks
    115

    Re: using TI-83 to sovle angle between two vectors question...

    Quote Originally Posted by sara213 View Post
    So I'm following along in my book where it comes to put the final values in the equation:


    cosO=u*v/(|u|*|v|) <--- nearly correct

    = -1/sqrt 6 (5)

    and I should get -0.14 But I'm not getting it?

    am I inputting it into the calculator the wrong way?

    I use cos^-1(-1/sqrt 6 (5)) but I get 1.85 and not -0.14
    1. I don't understand this term: -1/sqrt 6 (5)

    Do you mean
    -1/(sqrt(6)* (5)) .....or: -1/(sqrt(6)) * (5) .....or: (-1/(sqrt(6)) * (5) .....or: -1/sqrt((6)* (5))
     -\frac1{\sqrt{6} \cdot 5} ................or:  -\frac1{\sqrt{6}} \cdot 5 .................................................. .or:  -\frac1{\sqrt{6 \cdot 5}}

    2. To help you with your calculations please post the complete question, especially the vectors with their components, and your own work.
    Last edited by earboth; July 18th 2011 at 10:41 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Vectors and an angle
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: April 6th 2011, 09:24 AM
  2. Angle between two vectors
    Posted in the Math Software Forum
    Replies: 6
    Last Post: November 22nd 2010, 07:40 AM
  3. Replies: 3
    Last Post: September 20th 2009, 04:11 PM
  4. how can I sovle the Sensitivity question
    Posted in the Calculus Forum
    Replies: 6
    Last Post: June 11th 2009, 06:00 PM
  5. Replies: 2
    Last Post: April 22nd 2009, 11:43 PM

Search Tags


/mathhelpforum @mathhelpforum