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Math Help - Circular Functions & Trig

  1. #1
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    Circular Functions & Trig



    With this second one, I understand why sine x cannot equal 0 but I do not understand/have no idea what kpi is


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  2. #2
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    Hello juliak

    The comments in red are correct: it should read
    \tan\theta =\pm\tfrac12
    But I don't know what you mean by
    Quote Originally Posted by juliak View Post

    With this second one, I understand why sine x cannot equal 0
    Is there any suggestion that \sin x is equal to 0?

    Also
    but I do not understand/have no idea what kpi is
    I don't know what kpi stands for either. Where does it appear anyway?

    Grandad
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    Quote Originally Posted by Grandad View Post
    Hello juliak

    But I don't know what you mean byIs there any suggestion that \sin x is equal to 0?

    AlsoI don't know what kpi stands for either. Where does it appear anyway?

    Grandad

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  4. #4
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    Hello juliak
    Quote Originally Posted by juliak View Post
    OK. I now know what kpi is: k \pi. But I still don't see where \sin x \ne 0 is relevant in your original post.

    However, what you have written here is easy to understand. If \sin x \ne 0, then x cannot be a multiple of \pi. (Since the sine of all multiples of \pi is zero.) In other words:
    \sin x \ne 0

    \Rightarrow x \ne k\pi, where k is an integer

    \Rightarrow x \ne 0 + k\pi
    Have we cleared all this up now?

    Grandad
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