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 (x)

  1. Feb 28, 2005 #1
    hey ....


    find (x) ...
    (sin x )^6 + (cos x) ^6 = 5/6 ( (sin x)^4 + (cos x)^4)

    cheers
     
  2. jcsd
  3. Feb 28, 2005 #2
    x= 22.5
    .. I think
     
    Last edited: Feb 28, 2005
  4. Feb 28, 2005 #3

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    There's the same problem posted in the "Brain Teasers" Section where i've given the correct answers...

    Daniel.
     
  5. Feb 28, 2005 #4

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    If a problem involving trig functions does not specifically involve angle measured in degrees, x must be in "radians".

    x= pi/8 is correct.
     
  6. Feb 28, 2005 #5
    How do you solve such a problem? (Involving both functions)
     
  7. Mar 1, 2005 #6

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Use that:[tex] \sin^{2}x=1-\cos^{2}x [/tex] and the fact that the powers in the equation are even...:wink:

    Daniel.
     
  8. Mar 1, 2005 #7

    Zurtex

    User Avatar
    Science Advisor
    Homework Helper

    Erm, I think if you play around with it a bit you should be able to reduce it to :

    [tex]\cos 4x = 0[/tex]
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Find (x)
  1. Finding X (Replies: 1)

  2. Finding constant X (Replies: 0)

Loading...