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Math Help - trig function - quickie

  1. #1
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    trig function - quickie

    Hey, could someone v. quickly go thru the calculator process of solving

    h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

    I've got 5.61, as im creating a table, just wanna check im doing it right....thnks
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  2. #2
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    Quote Originally Posted by bobbymellor View Post
    Hey, could someone v. quickly go thru the calculator process of solving

    h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

    I've got 5.61, as im creating a table, just wanna check im doing it right....thnks
    This value is wrong. Your calculator is currently in degree mode. It should be in RADIAN mode.
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  3. #3
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    now i get 31.5, is that right??
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    Quote Originally Posted by bobbymellor View Post
    now i get 31.5, is that right??
    No. You should realise that this answer is absolutely impossible since sine is always between -1 and 1.

    The answer is 9.5. I have no idea what you're doing wrong. Are you using brackets appropriately.
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  5. #5
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    ok .....could you please show me how to do it on a calculator...i don't know what im doing wrong either
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  6. #6
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    Quote Originally Posted by bobbymellor View Post
    ok .....could you please show me how to do it on a calculator...i don't know what im doing wrong either
    h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

    Get sin (5 Pi/2).

    Multiply the answer by 4.5.

    Add 5 to this answer.
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