Simplify : 1 - {1 + (a2 - 1)-1}-1?

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Question 1:

Simplify : 1 - {1 + (a² - 1)^-1}^-1?

A. 1/a²

Feedback 1 - {1 + (a² - 1)^-1}^-1 = 1 - {1 + 1/a² - 1}^-1 = 1 - {a² / a² - 1}^-1 = 1 - (a² - 1)/a² = 1/a²..

B. .a²

C. -1/a²

D. -a²

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