If x = a + 1, y = a - 1, then the value of a a x4 + y4 - 2x2 y2 is – McqOptions

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1.	If x = a + 1, y = a - 1, then the value of a a x4 + y4 - 2x2 y2 is
A.	16
B.	20
C.	10
D.	5
Answer» B. 20

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