If p+1/p=3 then find the value of 3(p²-1/p²)
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p+1/p = 12
=> (p+1/p)^2 = 144
=> p^2+(1/p)^2 +2(p)(1/p) = 144
=> p^2+1/p^2+2 = 144
=> p^2+1/p^2 = 142
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