a=√7+√6/√7-√6,b=1/afind a2+b2
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a=(√7+√6)/(√7-√6)
b=1/a=(√7-√6)/(√7+√6)
a^2+b^2=(a+b)^2-2ab
=(((√7+√6)/(√7-√6))+((√7-√6)/(√7+√6)))^2-2
=(((√7+√6)^2+(√7-√6)^2)/((√7+√6)(√7-√6)))^2
=(26)^2
=676
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