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By using pascles's triangle expand (2x+3...

By using pascles's triangle expand `(2x+3y)^(4)`.

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`(2x+4y)^(4)=2(x)^(4)+4(2x)^(3)(3y)+6(2x)^(2)(3y)^(2)+4(2x)(3y)^(3)+(3y)^(4)`
`=16x^(4)+96x^(3)y+216x^(2)y^(2)+216xy^(3)+81y^(4)`
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