If x=a+1ax=a+1a and y=a−1a,y=a−1a, then the value of x4 + y4 - 2x2 – McqOptions

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1.	If x=a+1ax=a+1a and y=a−1a,y=a−1a, then the value of x4 + y4 - 2x2y2 is?
A.	24
B.	18
C.	16
D.	12
Answer» B. 18

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