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b. (a^-1 + b^-1 / a^-2 - b^-2) ^2 = a^-2 + b^-2 / a^-4 - b^-4 = a^4 - b^4 / a^2 + b^2
semoga bermanfaat ^^ m
2. a^-2 + b^-2 / a^-4 - b^-4 = a^4 - b^4 / a^2 + b^2 =
(a^2 - b^2 ) ( a^2 + b^2) / (a^2 + b^2) = a^2 - b^2
^ = pangkat
/ = per
( a^2 + b^2) dicoret