if a² - 3a + 1 = 0 find 1. a²+ 1/ a² 2. a³ + 1/ a³
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(a+1/a)=3
{(a^2)+(1/a^2)}=7
[(a^3)+(1/a^3)]=18
{(a^2)+(1/a^2)}=7
[(a^3)+(1/a^3)]=18
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