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Multiply (1/5x-1/4y)a n d\ (5x^2-4y^2)do...

Multiply `(1/5x-1/4y)a n d\ (5x^2-4y^2)dot`

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`(1/5x-1/4y)xx(5x^2-4y^2)`
`1/5x xx(5x^2-4y^2)-1/4yxx(5x^2-4y^2)`
`1/5x xx5x^2-1/5x xx4y^2-1/4yxx5x^2+1/4yxx4y^2`
`x^3-4/5xy^2-5/4x^2y+y^3`
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