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  1. 02-01-2016, 12:49 AM Top | #1
    Nov 2011
    1063
    0.21
    1,155
    Thanked: 503





    2 ( -)= 2


  2. 02-01-2016, 11:00 AM Top | #2
    Feb 2014
    18677
    ( )
    0.68
    3,129
    Thanked: 3674

    :

    x=7pi/4 +2k pi


    cos (2x-pi/4)(sin(x-pi/4)=1


    then x-pi/4=3pi/4 + 2 kpi

: 1 (0 1 )


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