Please solve these eq...
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we know that
p^2-q^2= (p+q) (p-q)
=(3^2000+3^-2000-3^2000+3^-2000)(3^2000+3^-2000+3^2000-3^-2000)
=(2*3^-2000)(2*3^2000)
=4ans
Is it is helpful
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