Keerthana
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If x2+1x2=2x^{2}+frac{1}{x^{2}}=2, then what is the value of x6?x^{6} ?

a

6

b

1

c

0

d

3

Answer : Option B
Explanation :

x2+1x2=2x^{2}+frac{1}{x^{2}}=2

x4+1=2x2Rightarrow x^{4}+1=2 x^{2}

x42x2+1=0Rightarrow x^{4}-2 x^{2}+1=0

(x21)2=0Rightarrowleft(x^{2}-1 ight)^{2}=0

x21=0x2=1Rightarrow x^{2}-1=0 Rightarrow x^{2}=1

x6=1 herefore x^{6}=1

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