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দেওয়া আছে, x4−x2+1=0
⇒ x4 + 1 = x2 ⇒ x2 + 1x2 = 1 ⇒ x + 1x 2 - 2 × x × 1x = 1 ⇒ x + 1x 2 -2 = 1 ⇒ x + 1x 2 = 3 ∴ x + 1x = 3
এখন, x3 + 1x3 = x + 1x 3 - 3 × x × 1x x + 1x
= 33 - 33 = 33 - 33 = 0
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