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Thread: Half Angle of Tan

  1. #1
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    Half Angle of Tan

    Given that tan(a)=-5/sqrt11, find the exact value of tan(a/2).

    I'm getting Half Angle of Tan-capture2.png, but it says I'm wrong?
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  2. #2
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    Re: Half Angle of Tan

    Quote Originally Posted by silentwhspr22 View Post
    Given that tan(a)=-5/sqrt11, find the exact value of tan(a/2).

    I'm getting Click image for larger version. 

Name:	Capture2.PNG 
Views:	7 
Size:	2.1 KB 
ID:	38601, but it says I'm wrong?
    Have a look at this.
    Thanks from silentwhspr22
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    Re: Half Angle of Tan

    I still don't get it. I've been working on this problem for over an hour now and can't make it make sense.
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    Re: Half Angle of Tan

    Quote Originally Posted by silentwhspr22 View Post
    I still don't get it. I've been working on this problem for over an hour now and can't make it make sense.
    The most "powerful computional" resource, wolframapha available , agrees with your answer: SEE HERE
    That means you are giving the program a form of the answer that it does like or the program is just wrong. Your answer is correct and the form you are entering is not liked. This is a common problem with web-based mathematics programs. That is why many of us say: Ban all online mathematics courses!
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    Re: Half Angle of Tan

    AMEN to that! Thank you!
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    Re: Half Angle of Tan

    Quote Originally Posted by silentwhspr22 View Post
    AMEN to that! Thank you!
    Here are two forms that the program may like!
    $\dfrac{5}{{6 + \sqrt {11} }}$ OR $\dfrac{{6 - \sqrt {11} }}{5}$

    Please try these and tell us if either works.
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