If x = 3^1/4 +3^-1/4 and y = 3^1/4 – 3^-1/4, then the value of 3(x² + y²)^2will be
(a) 12
(b) 18
(c) 46
(d) 64
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❥Answer
❥Option B
❥18
❥Brainliest pls
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