Using suitable identity expand
(3x+4y)³
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3x³+6x²4y+8x4y²+4y³
........
(3x+4y)^3
3x^3+4y^3+3×3x^2×4y+3×3x×4y^2
27x^3+64y^3+12y×9x^2+9x×16y^2
27x^3+64y^3+ 108x^2y+144xy^2
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