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Math Help - TI-89 Titanium: EVALUATING

  1. #1
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    Exclamation TI-89 Titanium: EVALUATING

    I need to get an answer for this
    arccos(0.3) on [0, pi)

    What do i need to press to get an answer for that?

    Thank you.
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  2. #2
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    Quote Originally Posted by tupac View Post
    I need to get an answer for this
    arccos(0.3) on [0, pi)

    What do i need to press to get an answer for that?

    Thank you.
    Press mode and make sure you're in radian mode.
    Press the green key (diamond), then z, then (, then 0.3, then ), then ENTER.
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    Press mode and make sure you're in radian mode.
    Press the green key (diamond), then z, then (, then 0.3, then ), then ENTER.
    What if i have this:
    arccos(0.3) on [0, 2pi)

    Does it change anything?
    And for the first problem do i need to include the [0,pi) anywhere when i input the numbers?
    Also what should i press for my calculator to show: arccsc
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  4. #4
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    Quote Originally Posted by tupac View Post
    What if i have this:
    arccos(0.3) on [0, 2pi)

    Does it change anything?
    And for the first problem do i need to include the [0,pi) anywhere when i input the numbers?
    Also what should i press for my calculator to show: arccsc
    The range of the arcos function is not defined over [0, 2pi).

    I'm guessing that your question is actually how to solve \cos \theta = 0.3 for 0 \leq \theta < 2 \pi. You go to the F2 menu and select 1: solve(

    Then it's

    solve(cos x = 0.3, x)|0<x<2pi
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  5. #5
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    Quote Originally Posted by mr fantastic View Post
    The range of the arcos function is not defined over [0, 2pi).

    I'm guessing that your question is actually how to solve \cos \theta = 0.3 for 0 \leq \theta < 2 \pi. You go to the F2 menu and select 1: solve(

    Then it's

    solve(cos x = 0.3, x)|0<x<2pi
    what should i press for my calculator to show: arccsc
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  6. #6
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    Quote Originally Posted by tupac View Post
    what should i press for my calculator to show: arccsc
    There're no buttons.

    It's a nasty surprise for many students when they discover that sometimes you actually have to understand the mathematical concepts before you can press buttons on the CAS calculator and get an answer.

    \text{arccsc} (a) = \theta \Rightarrow \text{csc} \, \theta = a \Rightarrow \frac{1}{\sin \theta} = a \Rightarrow \sin \theta = \frac{1}{a} \Rightarrow \theta = \arcsin \left( \frac{1}{a}\right).


    What? It's not April Fools day where you live ......?

    Then I guess I better say that I'm joking and that you go to the MATH A:Trig menu and scroll down to what you want ..... Note that \text{csc}^{-1} means the same as arccsc .......


    p.s. I wasn't joking about the nasty surprise business ......

    p.p.s. Read the TI-89 Titanium manual (download it from the TI website if you did what most other students do and lost it 42 seconds after opening the packaging of your calculator).
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