If \( \Large a^{x} = b \), \( \Large b^{y} = c \) and \( \Large xyz = 1 \)then what is the value of \( \Large \left(a^{2} + a^{-2}\right)^{?} \)

A) a

B) b

C) ab

D) a / b

Correct answer:
A) a

Description for Correct answer:

Given. \( \Large  xyz =1, a^{x} = b, b^{y} = c \)

Now, \(  \Large b = a^{x} \)

=> \( \Large  b^{y} = a^{xy} \)

=> \( \Large  b^{yz} = a^{xyz} \)

=> \( \Large  c^{z} = a \)



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