find a square - b square if a = 3 - root 5 divided by 3 + root 5 and b = 3+ root 5 divided by 3 - root 5
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if a=1/b then a+b =2(a+b)/a-b
a+b= 2*(9+5)/9-5=7
a-b=4√ab/a-b
a-b=4√45/4=√45
a2-b2=7*√45=21√5
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