Results 1 to 4 of 4

Math Help - Solving for t

  1. #1
    Junior Member
    Joined
    Feb 2011
    Posts
    58

    Solving for t

    5 = 11-10cos(0.1pit)

    -6 = -10cos(0.1pit)

    -6/-10 = cos(0.1pit)

    3/5 = cos(0.1pit)

    cos^-1(3/5) / (0.1pi) = t

    t = 169.118 however the answer should be 2.952
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member Quacky's Avatar
    Joined
    Nov 2009
    From
    Windsor, South-East England
    Posts
    901
    Your method is fine, but as you're working in terms of pi, it's radians that you should be using.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Looks like your calculator is in degrees mode instead of radians mode - nothing wrong with the working
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78
    Quote Originally Posted by Devi09 View Post
    5 = 11-10cos(0.1pit)

    -6 = -10cos(0.1pit)

    -6/-10 = cos(0.1pit)

    3/5 = cos(0.1pit)

    cos^-1(3/5) / (0.1pi) = t

    t = 169.118 however the answer should be 2.952
    The answers are the same but in different "units"

    the first one is in degree's and the 2nd one is in radians.

    Just change your calculator to Radian mode and you will get the same thing.

    Too slow X2
    Last edited by TheEmptySet; May 15th 2011 at 03:01 PM. Reason: extra extra slow
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. help solving
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 6th 2010, 09:35 AM
  2. solving for x
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 1st 2010, 06:48 PM
  3. Solving
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 4th 2009, 07:47 PM
  4. Solving for h
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 16th 2008, 08:36 PM
  5. Replies: 3
    Last Post: October 11th 2006, 10:15 PM

Search Tags


/mathhelpforum @mathhelpforum