ab(x²+y²)+xy(a²+b²) factorize the following
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ab(x²+y²) + xy(a²+b²)
ab(x²+y²) + xy(a²+b²) = abx² + aby² + a²xy + b²xy
ab(x²+y²) + xy(a²+b²) = abx² + aby² + a²xy + b²xy = abx² + b²xy + aby² + a²xy
= bx(ax + by) + ay (by + ax)
= bx(ax + by) + ay(ax + by)
= (ax + by) ( bx + ay)
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