find the cube of 3x-5y
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using formula= a³-b³-3ab(a+b)
(3x-5y)³ = 3x³-5y³-3×3x×5y(3x-5)
= 27x³-125y³-45xy(3x-5y)
=27x³-125y³-135x²y+225xy².......
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