Results 1 to 3 of 3

Thread: My Calculator? Is it me or is it the calculator?

  1. #1
    Senior Member
    Joined
    Jul 2015
    From
    United States
    Posts
    377
    Thanks
    6

    My Calculator? Is it me or is it the calculator?

    First off, I have been trying to do -2 times something, during law of cosines. But whenever I put a subtract sign first, it always put Ans in front of it, and it is so annoying how do I fix it? Also secondly,, I cannot divide by any negative numbers or when I use trig functions inverse I cannot use negative numbers, or else it says "synthrax error"???? I have a Texas Intstrument 30XIIS


    Update: I click ans, and that subtracts as well, (without pressing 2nd), is that how I am always suppose to do it??? If so I feel dumb.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Nov 2013
    From
    California
    Posts
    5,919
    Thanks
    2491

    Re: My Calculator? Is it me or is it the calculator?

    is there a +/- key on it? That's usually the change sign key, not the "-" key.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    16,191
    Thanks
    3686

    Re: My Calculator? Is it me or is it the calculator?



    try this ...

    law of cosines calculation ... two sides, say 5 & 6 and angle between them 67 degrees

    key strokes marked by brackets ... [key]

    toggle [DRG] key to get in degree mode

    [2nd] [sqrt] [ ( ] [5] [x^2] [+] [6] [x^2] [minus key, not the (-) key] [2] [times] [5] [times] [6] [times] [cos] [6] [7] [ ) ] [ ) ] [ENTER]

    note: cosine key should display cos(; you need two close parentheses at the end as shown, one for the 67 degrees and the other to close the radical.

    you should get 6.128305...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Calculator help
    Posted in the Calculus Forum
    Replies: 3
    Last Post: Feb 15th 2013, 08:42 PM
  2. Replies: 2
    Last Post: May 6th 2012, 03:16 PM
  3. 401(k) Calculator
    Posted in the Math Software Forum
    Replies: 0
    Last Post: Jul 4th 2011, 12:43 PM
  4. Your Calculator
    Posted in the Calculators Forum
    Replies: 19
    Last Post: Sep 1st 2010, 07:11 AM
  5. Which is the right calculator?
    Posted in the Calculus Forum
    Replies: 6
    Last Post: Apr 27th 2008, 11:45 AM

Search Tags


/mathhelpforum @mathhelpforum