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Math Help - trignometry

  1. #1
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    trignometry

    Hi,

    I have my calculator in radians. I just need to know what to put in. I tried doing this but values I was getting didn't seem right.

    Any help with this would be greatly appreciated.

    Thanks
    Last edited by elephunk; November 25th 2008 at 02:05 PM.
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  2. #2
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    Quote Originally Posted by elephunk View Post
    Hi,

    I have my calculator in radians. I just need to know what to put in. I tried doing this but values I was getting didn't seem right.

    http://i45.photobucket.com/albums/f9...lles/table.jpg

    Any help with this would be greatly appreciated.

    Thanks
    I checked the values already listed in the table and they were correct. Here is one of them:

    y=5-3\sin\left(\frac{\pi t}{6}+\frac{\pi}{4}\right)

    If t = 4,

    y=5-3\sin\left(\frac{4\pi }{6}+\frac{\pi}{4}\right)=4.22354265\approx 4.22

    Be sure you entered correctly in your calculator. Here is the sequence for the one I just did.

    5 - 3 sin((4 \pi / 6 + (\pi / 4))

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  3. #3
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    Okay, So for 3.0 on the first table it would be something like this?

    5 - 3 sin((4 \pi / 6 + (\pi / 4))

    Do I do the same thing for the second table? The value for 24.0 is 2.88 which is totally different.

    Thanks
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  4. #4
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    Quote Originally Posted by elephunk View Post
    Okay, So for 3.0 on the first table it would be something like this?

    5 - 3 sin(({\color{red}3} \pi / 6 + (\pi / 4))

    Do I do the same thing for the second table? The value for 24.0 is 2.88 which is totally different.

    Thanks
    You replace t with 3. When you do you get:

    5 - 3 sin(({\color{red}3} \pi / 6 + (\pi / 4))=2.88

    If t=24, then

    5 - 3 sin(({\color{red}24} \pi / 6 + (\pi / 4))=2.88

    Here's your table

    (t, y)= (0, 288), (1, 2.10), (2, 2.10), (3, 2.88), (4, 4.22), (5, 5.78), (6, 7.12), (7, 7.90), (8, 7.90), (9, 7.12), (10, 5.78), (12, 2.88), (14, 2.10), (16, 4.22), (18, 7.12), (24, 2.88)
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  5. #5
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    Thanks I was working it out correctly then

    Just needed to check.

    Thanks again
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