if a^2+1/a^2=18and a not equal to0 find (i)a-1/a (ii)a^3-1/a^3
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a^2+1/a^2=18
a²+(1/a²) -2 = 18-2
a²+(1/a²) -2a/a = 16
(a-1/a)² = 16
(a-1/a) = ±4
(ii)a^3-1/a^3
(a-1/a){ (a-1/a)² + 3a./a}
= ±4{ ( 16+3)
= ±4 × 19
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