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  • : .ggb

  • Conceptwww.wondershare.com

    www.wondershare.com

  • 1.

    2.

  • 1. = 90
  • 2. :

    ) ( + )2 + ( - )2 = 2) ( + )2 + ( - )2 = 2 + 2

  • 2 +2 = 1 ( )2 + ( )2 = 1 + = 1 :

  • www.wondershare.com

    www.wondershare.com