1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find the value of ?

  1. Apr 5, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the value of sin inverse (2 ) ?

    2. Relevant equations



    3. The attempt at a solution

    This was a question in my final exam & i had no clue about it
     
  2. jcsd
  3. Apr 5, 2008 #2
    is it a real value? what is the domain of the ArcSin function?
     
  4. Apr 5, 2008 #3
    No extra information was given
     
  5. Apr 5, 2008 #4

    Gib Z

    User Avatar
    Homework Helper

    Suppose such a value, k, exists, so that [tex]\arcsin 2 = k[/tex]. Then taking sines of both sides, [tex]sin (k) = 2[/tex]. However, the sine function is bounded between -1 and 1 for all real numbers. Hence there is no real solution.
     
  6. Apr 5, 2008 #5

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    … hyperbolic sines … !

    Hi mkbh_10! Hope you passed! :smile:

    Hint: cosh ix = cosx, and sinh ix = isinx.

    (that's why sinh is called the hyperbolic sin!)

    So sin(x + iy) = sinx cos iy + cosx sin iy = sinx coshy - i cosx sinhy;

    so you needed cosx = 0, and … ? :smile:
     
  7. Apr 5, 2008 #6


    But there is no hyperbolic sine function in the question ?

    I am studying in DU (Delhi University ) so results will only be out in mid July . I will definitely pass but i want top marks which i will not be getting in this paper coz of my silly mistakes .
     
  8. Apr 5, 2008 #7

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    What course is this for? That's important. If you are studying complex numbers in the course, then there is a solution, if not, there is no solution.

    And just because there is no "hyperbolic sine" in the problem doesn't mean you can't use one to solve it.
     
  9. Apr 5, 2008 #8
    i have not found it anywhere in my course , thats why i am asking , i didn't study this type of question neither did our teacher taught nor does the book has this type of questions
     
  10. Apr 5, 2008 #9
    i have studied complex numbers but i have no clue about it
     
  11. Apr 5, 2008 #10

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    … really unfair … !

    That's really unfair! :mad:

    (even if you've done things like log(-1) and log(i), sin(ix) isn't obvious, and should have been pointed out to you, IMO)

    (Check the official syllabus, to see if it's on it … if it's not, complain about the exam … if it is, check with your fellow students, and make a joint request for credit for that question … will your student union help you with that?)

    (btw, sin (π/2 - isinh^(-1)2) = 2)
     
  12. Apr 5, 2008 #11
    this is india, nothing happens at student level , & there are 30-40 clgs in DU that have this course & who knows what teacher teaches in a particular topic
     
  13. Apr 5, 2008 #12
    share your pain bro.. share your pain.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Find the value of ?
  1. Finding the value of a (Replies: 5)

  2. Find the values of a (Replies: 4)

  3. Find the value of A^2 (Replies: 7)

Loading...