Question:যদি `a - 1/a = 1` হয়, তবে দেখাও যে, `a^3 - 1/a^3 = 4` 

Answer দেওয়া আছে, `a - 1/a = 1` বামপক্ষ = `a^3 - 1/a^3` `= (a - 1/a)^3 + 3.a.1/a (a - 1/a)` [সূত্র ব্যবহার করে] `= (a - 1/a)^3 + 3(a - 1/a)` `= 1^3 + 3.1` ` = 1 + 3` = 4 = ডানপক্ষ `:. a^3 - 1/a^3 = 4` 

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jodi `a - 1/a = 1` hoyo, tobe dekhao je, `a^3 - 1/a^3 = 4`
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