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The Brainliest Answer!
2016-02-26T19:44:02+05:30
[a-b]²=a²-2ab+b²
       a=4/3m    b=3/4n
      =[4/3m]²-2*4/3m*3/4n+[3/4n]²
     =16/9m²-2mn+9/16n²
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