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Calle87 Group Title

Need some help identifying the increase intervals of the graph of xtanx

  • one year ago
  • one year ago

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  1. Calle87 Group Title
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    |dw:1349987981581:dw|

    • one year ago
  2. Venomblast Group Title
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    is this in radian?

    • one year ago
  3. Calle87 Group Title
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    i know this is a even function about the y axis, and the domain and asymptotes are pi/2,-pi/2

    • one year ago
  4. Calle87 Group Title
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    just wondering how to show the intervals of increase and decrease

    • one year ago
  5. Venomblast Group Title
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    so -90 degrees <x<90 degrees

    • one year ago
  6. Calle87 Group Title
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    usually i take f'x and solve for 0

    • one year ago
  7. Venomblast Group Title
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    i see

    • one year ago
  8. Venomblast Group Title
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    i see no 0. is this is an equation?

    • one year ago
  9. Calle87 Group Title
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    f'x=tanx+xsec^2x

    • one year ago
  10. Calle87 Group Title
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    @zepdrix hey do you think you could explain how they designate zero as a critical point?

    • one year ago
  11. Calle87 Group Title
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    |dw:1349988599121:dw|

    • one year ago
  12. Calle87 Group Title
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    should i just know that, from the x and y intercepts and the even symetry? and a basic knowledge of the tanx graph?

    • one year ago
  13. Calle87 Group Title
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    because when i set my derivative = 0 i have problems

    • one year ago
  14. zepdrix Group Title
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    |dw:1349988578994:dw| Hmm yah this derivative does seem to be putting up a fight :\ Hmmmmm

    • one year ago
  15. Calle87 Group Title
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    i tried changing everything to sines and cosines and still a mess

    • one year ago
  16. zepdrix Group Title
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    |dw:1349988855254:dw| Ah good call, I think that's how you find it! :) The top is a big mess, yes. But the bottom I think you can solve for a critical point.

    • one year ago
  17. Calle87 Group Title
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    |dw:1349988866328:dw|

    • one year ago
  18. Venomblast Group Title
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    get the common denominator. so multiply cosx on the 1st term

    • one year ago
  19. Calle87 Group Title
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    thats it zep!!!!!!!!

    • one year ago
  20. Venomblast Group Title
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    ? zep?

    • one year ago
  21. Calle87 Group Title
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    @zepdrix :D

    • one year ago
  22. Venomblast Group Title
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    i guess he/she got it from here

    • one year ago
  23. zepdrix Group Title
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    |dw:1349989056773:dw|

    • one year ago
  24. Calle87 Group Title
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    i think the top should be ignored

    • one year ago
  25. Calle87 Group Title
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    the book doesent have a mention of it

    • one year ago
  26. Calle87 Group Title
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    neither does the graph

    • one year ago
  27. Calle87 Group Title
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    the only root is 0

    • one year ago
  28. Calle87 Group Title
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    http://www.wolframalpha.com/input/?i=graph+xtanx

    • one year ago
  29. Calle87 Group Title
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    maybe it would matter if the interval was larger than -pi/2,pi/2

    • one year ago
  30. zepdrix Group Title
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    yah fair enough c:

    • one year ago
  31. zepdrix Group Title
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    Hmmm wait what was I saying? cos x = 0 Hmm that should give you x = pi/2 right? why did i say it was x = 0? Hmmmmmmmmmmmmmmmmm Now I'm back to being confused about where the 0 critical point is coming from :D lol

    • one year ago
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