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denominator of fraction can't be zero
so when we expand denominator. it is equal to (a+4)(a-4) which can never be zero
and it is zero at +4 and -4
so it's domain is all real number except +4 and -4
so when we expand denominator. it is equal to (a+4)(a-4) which can never be zero
and it is zero at +4 and -4
so it's domain is all real number except +4 and -4
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Thank you very much.
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