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দেওয়া অাছে, x+1/x=4 বা,(x²+1)/x=4 বা,x²+1=4x বামপক্ষ= (x²-4x+5)/4 =(x²-4x+4+1)/4 =(x²+1-4x+4)/4 =(4x-4x+4)/4 [x²+1=4x বসিয়ে] =4/4 =1 = ডানপক্ষ [প্রমাণিত ]
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