(2/3x+4/5y)(2/3x+4/5y)(2/3x + 4/5y)^2(a+b)^2a^2+ b^2+ 2ab2/3x^2 +2 × 2/3x × 4/5y +4/5y^24/9x^2 + 16/15xy + 16/25y^2
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