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Question

How [x+y]3=x3+y3+3xy[x+y] can become x3+y3=[x+y]3​-3xy[x+y]

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Solution

Dear student,

(x+y)3=x3+y3+3xy(x+y) (x+y)3-3xy(x+y)=x3+y3 --[taking 3xy(x+y) to left side ]or x3+y3=(x+y)3-3xy(x+y)

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