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anonymous

  • one year ago

\[\lim_{x \rightarrow \pi+}\sec2x\] is it positive or negative?

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  1. Empty
    • one year ago
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    Any ideas? Where are you stuck?

  2. tkhunny
    • one year ago
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    Is the cosine positive or negative in the neighborhood of \(\pi\)?

  3. anonymous
    • one year ago
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    I don't know I just cant't grasp the concept.

  4. anonymous
    • one year ago
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    this is one part of calculus I am just struggling with

  5. Empty
    • one year ago
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    Explain what you do understand and I can help you understand and fill in the gaps if you want to learn.

  6. anonymous
    • one year ago
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    When its on the graph i can get it but my teacher doesn't want us using a graph

  7. anonymous
    • one year ago
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    usually I can solve backward when I don't understand it

  8. tkhunny
    • one year ago
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    Come on... \(\cos(\pi) = -1\) \(\cos(2\pi) = +1\) What do we know about \(\sec(2\pi)\)?

  9. anonymous
    • one year ago
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    i have class but I will tr again later. hopefully It will help when i log back on

  10. Empty
    • one year ago
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    @Clare12 Well you are trying to run before you can walk if you don't use graphs. You need to spend more time visualizing roughly what trigonometric graphs look like with several common values such as \(\pi\) or \(\frac{\pi}{2}\) and others.

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spraguer (Moderator)
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