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Math Help - Just simple calculation

  1. #1
    Junior Member
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    Just simple calculation

    f(X)=2 sin x - x
    When x = 1 , f(X)= 0.683 , why?

    f(1) = 2 sin 1 -1
    By using calculator, I got sin 1 = 0.017452406 ( wrong).
    But taking sine of 1 = 0.84147 ( right) , how to get sin of 1 = 0.84147 , anyone mind explaining it to me?

    Thanks in advance.

    Got it , I have to convert it to angle first.

    1/pi x 180 deg = 57.29 deg , sin 57.29 = 0.84147
    Last edited by ose90; September 23rd 2008 at 05:33 AM.
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  2. #2
    MHF Contributor
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    Make sure you are aware of and you check your calculator settings. You just never know when the calculator gnomes will sneak into your room and switch it from radians to degrees. You'll be further mystified if they find the "GRADS" setting.

    On my financial calculator, it has setting for "End of Period" and "Beginning of Period". One must select the correct setting to get the right answer. Personally, it does not matter how many times I have hit those buttons, I ALWAYS reset for the value that I want - always!

    Never leave it to the gnomes!
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  3. #3
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    Quote Originally Posted by TKHunny View Post
    Make sure you are aware of and you check your calculator settings. You just never know when the calculator gnomes will sneak into your room and switch it from radians to degrees. You'll be further mystified if they find the "GRADS" setting.

    On my financial calculator, it has setting for "End of Period" and "Beginning of Period". One must select the correct setting to get the right answer. Personally, it does not matter how many times I have hit those buttons, I ALWAYS reset for the value that I want - always!

    Never leave it to the gnomes!
    Thanks for your advice. I have changed the mode to RAD and everything's solved .
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