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Math Help - [SOLVED] How do I find tan?

  1. #1
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    Talking [SOLVED] How do I find tan?

    Instructions: Find value of Expression to nearest four significant digits.

    tan 100
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  2. #2
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    Can you use a calculator? There are many approximation methods, the most common I think to use for this would be the Taylor series for tangent.
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  3. #3
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    Is there a simpler way or is calculator the easiest method?
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  4. #4
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    I really don't know how your teacher wants you to do this. You could use the difference formula for tan(120-20) since 120deg = (2pi)/3 and 20deg=pi/9. Have you guys been doing angle sums in class?

    edit: If you can't give some sort of direction then it won't be able to fully help you as like I said there are many ways to approximate trig functions. I can help you but I need info.
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  5. #5
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    ok, I found the tan of 120deg, but how do I find the tan of 20deg?

    Edit: Yes. I believe I am learning angle sums.
    Last edited by RaphaelB30; February 10th 2009 at 04:28 PM. Reason: missed something
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  6. #6
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    Quote Originally Posted by RaphaelB30 View Post
    Instructions: Find value of Expression to nearest four significant digits.

    tan 100
    the instructions makes it clear what you need to do.

    get out your calculator ...

    \tan(100) = -5.671
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  7. #7
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    Haha thanks skeeter. To be honest I am blanking on a way to find tan20 by hand. I'm sure others know. Be patient.
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  8. #8
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    Quote Originally Posted by Jameson View Post
    You could use the difference formula for tan(120-20) since 120deg = (2pi)/3 and 20deg=pi/9. Have you guys been doing angle sums in class?
    How would I do it this way? I already found sin of 120 deg.
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  9. #9
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    If doing this by hand, you have to figure out a way to express tan20, which I can't think of right now.
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  10. #10
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    Smile Never Mind

    This problem wasn't intended to be that difficult. I think it was looking for the calculator way. Thanks very much Jameson and Skeeter.
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