What is the coeffiicient of x^2 y^2 in the expansion of (x + y)^4 + (x + 8y)^4?
\(What\ is\ the\ coeffiicient\ of\ x^2 y^2?\)
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\((x + y)^4 + (x + 8y)^4=2x^4+36x^3y+390x^2y^2+2052xy^3+4097y^4\)
The coeffiicient of x^2 y^2 is 390.
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