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{(1 + x^{2})}^{- 3}

x^{4 r}

এর সহগ বের কর ।

2 r (r + 1)

(2 r - 1) (r - 1)

(r + 1) (2 r - 1)

(2 r + 1) (r + 1)

ANS : 4

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