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  1. 03-07-2014, 04:40 PM Top | #1
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  3. 03-08-2014, 11:31 AM Top | #2
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  5. 03-12-2014, 01:17 AM Top | #3
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    cos a = x+y-1 / y+1

    ( -1 , 2 ) .... cos a = /



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