Hi animea, for part a)
use x^2=e to find a relation between x and it's inverse
then,
consider (xy)^2
for part b) i will try on it but what do you mean by 1 ??
is it the identity of the real number or what because you didn't mentioned the nature of that set S
hope you enjoy group theory,
Are you studying in a college?
If yes what and where?
bye
.
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