if a is not equal to 0 and a-1 by a = 3 ; find: (1) a square + 1 by a square (2) a qube - 1 by a qube
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a+1/a=3
(a+1/a)^=3^2
a^2+2.a.1/a+1/a^2=9
a^2+2+1/a^2=9
a^2+1/a^2=9-2=7
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