1.

If \(\frac{{2 - \sqrt 5 }}{{2 + \sqrt 5 }} = a\) and \(\frac{{2 + \sqrt 5 }}{{2 - \sqrt 5 }} = b\) then, the value of a2 - b2 is:

A. 12√5
B. -144√5
C. 62√5
D. 5√5
Answer» C. 62√5


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