there is a question in test m15
from 1 we get a^2=b^2
but in answer its given
i have doubt regarding mod
so above how can we write a^2=|a|
because here a &b both are variable.
|a|=root a^2; in all cases, but when you are equating a variable to variable a^2=b^2,
==> |a|=|b|, you have to right it this way.
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