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  • 15-11-2011 6:03pm
    #1
    jimmy11
    Registered Users, Registered Users 2 Posts: 66 ✭✭


    Hey lads

    can anyone direct me in the right way with solving this

    (cosh2x - cos2x) (cosh2x+ cos2x)
    x = 2

    I cant remember how its done at all bein a while

    cheers


Comments

  • #2
    jimmy11
    Registered Users, Registered Users 2 Posts: 66 ✭✭jimmy11


    to be honest my maths are brutal its bein years

    i havin a clue just need this solved or shown how to


  • #3
    henbane
    Registered Users, Registered Users 2 Posts: 1,636 ✭✭✭henbane


    What Ray says below


  • #4
    ray giraffe
    Registered Users, Registered Users 2 Posts: 338 ✭✭ray giraffe


    Another way to do it would be to use formulas from here:

    [latex] \cos^2(A)=\frac{1}{2}(\cos(2A)+1) [/latex]

    [latex] \cosh^2(A)=\frac{1}{2}(\cosh(2A)+1) [/latex]

    So, [latex] \cosh^2(A) - \cos^2(A) = ??? [/latex]


  • #5
    jimmy11
    Registered Users, Registered Users 2 Posts: 66 ✭✭jimmy11


    cheers thanks lads


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