90-94. Useful factorization formula Calculate the following limits using the factorization formula x" a" = (x − a) (x²−¹+ ax² n-2 where n is a positive integer and a is a real number. x² + 1 92. lim x-1 x + 1 n-3 + a²x' + ... + a -²x + a²-¹), (Hint: Use the formula for x7 - a² with a = : -1.)

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