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Coefficient of y^4 x^2 in expansion of (y^2-x)^4
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Coefficient of y^4 x^2 in expansion of (y^2-x)^4

User Jerryno
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Hello,


(y^2 - x)^4=(-x)^(4)+4(-x)^(3)y^(2)+6(-x)^(2)y^(4)-4xy^(6)+y^(8)

Coefficient =6=(-1)^2 * 2P4=1*4*3/2!
User Gothiquo
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