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完成下面的证明.

已知:如图,互补,

求证:

证明:∵互补,

, (已知)

                  ▲                                    ▲                   . (                  ▲                  

. (                  ▲                  

又∵ , (已知)

. (                  ▲                  

                  ▲                                    ▲                   . (                  ▲                  

. (                  ▲                  

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