দেওয়া আছে, x4+y4−2x2y2
= x22 - 2 × x2 × y2 + y22 = x2- y22 = x+y x-y2
= a+ 1a + a- 1a a+ 1a - a+ 1a2[মান বসিয়ে]
2a a+ 1a - a+ 1a2 = 2a × 2 × 1a2 = 42 = 16
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