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  1. Top | #1

    Apr 2012
    14804
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    0.14
    598
    Thanked: 119

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    [/CENTER]

    without using the calculator

    find cos5

    khaled yassien












    co ED







    ( )














    :
    18 18






    15 15




    22.5 22.5





    12 12







    -




    -





    -




    :
    (/2) (/2) (/2)
    :

    > 2 = ( + )
    : / = / = /
    / = ( + )/( + ) = 2 /( + )
    2 = ( + ) ... ... ... (1)
    + + = 180 > /2 = 90 - ( + )/2
    (1)
    4 (/2).(/2) = 2*[( + )/2 ]*[( - )/2]
    2*(/2)*(/2) = (/2)*[(/2).(/2) + (/2).(/2)]
    2 (/2) = [(/2).(/2) + (/2).(/2)]
    2 [( + )/2] = [(/2).(/2) + (/2).(/2)]
    2*[(/2).(/2) - (/2).(/2)] = [(/2).(/2) + (/2).(/2)]
    (/2).(/2) = 3*(/2).(/2)
    (/2).(/2)
    (/2).(/2) = 3 ... ... ... (2)
    (/2) = [( + )/2] = [(/2) + (/2)] [1 - (/2).(/2)]
    ((/2).(/2))
    (/2) = [(/2) + (/2)] [(/2).(/2) - 1]
    (2)
    (/2) = [(/2) + (/2)] 2
    2*(/2) = (/2) + (/2)
    :
    (/2) (/2) (/2)



    / _








    monster

    cos(x+x)= cosx-sinx
    sin( x+x)= 2sin x *conx







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  2. Top | #2

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119
    -








  3. Top | #3

  4. Top | #4

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119





  5. Top | #5

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119








  6. Top | #6

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119





  7. Top | #7

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119





  8. Top | #8

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119





  9. Top | #9

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119










  10. Top | #10

    Apr 2012
    14804
    -
    0.14
    598
    Thanked: 119







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