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Math Help - Trig Prove

  1. #1
    Member srirahulan's Avatar
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    Post Trig Prove

    sec8A - 1 /sec4A - 1 =tan 8A / tan 4A
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  2. #2
    MHF Contributor
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    Re: Trig Prove

    \sec(8\alpha)-\frac{1}{\sec(4\alpha)}-1=\frac{\tan(8\alpha)}{\tan(4\alpha)} is false in general; see the graphs. Now, I know you want to prove \frac{\sec(8\alpha)-1}{\sec(4\alpha)-1}=\frac{\tan(8\alpha)}{\tan(4\alpha)}, but how can you deal with trigonometry if you don't know the order of arithmetic operations? The second equality is also false in general; see the graphs.
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