Question
`(1)/(1 + a^((n -m)))+ (1)/(1 + a^((m - n)))` = ?
Answer: Option C
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`(1)/(1 + a^((n -m)))+ (1)/(1 + a^((m - n)))` = `(1)/((1 + a^n/a^m))+ (1)/((1 + a^m/a^n))`
=`(a^m)/((a^m + a^n)) + (a^n)/((a^m + a^n))` = `((a^m + a^n))/((a^m + a^n))` = 1.
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