x³+1/125x³ if x²+1/25²= 43/5
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Required answer = 126/5
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Actually the formula is: (a+b)³ = a³ + b³ + 3ab(a + b) · here, a = x and b = 1/5x · so, 3ab = 3 * x * (1/5x) · 3ab = 3/5 · I
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