A 22
B 34
C 40
D 56
Correct Answer: Option B
a4-1/a4= (a2)2-(1/a2)2= (a2+1/a2)2-2.a2.1/a2= {(a-1/2)2+2.a.1/a}2-2= {(a-1/a)2+2}2-2= (22+2)2-2= 62-2= 36-2= 34
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