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Find the following products: 7/5x^2y(3...

Find the following products: `7/5x^2y(3/5x y^2+2/5x)` `4/3a(a^2+b^2-3c^2)`

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(i)`7/5x^2y(3/5x y^2+2/5x)`
`=(21/25)x^3y^3+(14/25)x^3y`

(ii) `4/3a(a^2+b^2-3c^2)`
`=(4/3)a^3+(4/3)ab^2-4ac^2`
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