Question

. Let f(x, y) = x2 y(2 − x + y2 )5 − 4x2 (1 +...

. Let f(x, y) = x2 y(2 − x + y2 )5 − 4x2 (1 + x + y)7 + x3 y2 (1 − 3x − y)8 . Find the coefficient of x5y3 in the expansion of f(x, y).

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