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119
Step-by-step explanation:
2a - 1/ 2a = 3
(2a - 1/2a)^2 = 3^2
4a^2 - 2 + 1/4a^2 = 9
4a^2. + 1/4a^2 = 11
(4a^2 + 1/4a^2)^2 = 11^2
16a^4 + 2 + 1/16a^4 = 121
16a^4 + 1/16a^4 = 119
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