simplify the following-
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4√(81)^-2
= 4√(1/{81^2})
= (1/{[9^2]^2})^1/4
= (1/{9^4})^1/4
= {(1/9)^4}^1/4
= 1/9
= 4√(1/{81^2})
= (1/{[9^2]^2})^1/4
= (1/{9^4})^1/4
= {(1/9)^4}^1/4
= 1/9
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