If a+1/a=p and a-1/a=q. find the value of p 2 -q 2
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Given
P=a+1/a
Q=a-1/a
P^2-q^2= (p+q)(p-q)
= (a+1/a +a-1/a)(a+1/a -a-1/a)
= a × 2/a
= 2
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