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Answer:
x= a+√a^2-1
x-a= √a^2-1
squaring on both sides
(x-a)^2= a^2-1
x^2+a^2-2xa=a^2-1
x^2-2xa=-1
x^2+1=2xa
x^2+1/2x = a
therefore a= x^2+1 ÷2x
thnk u..