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α = sin36º is a root of which of the following equation ?

1. 16x 4 – 10x 2 – 5 = 0
2. 16x 4 + 20x 2 – 5 = 0
3. 16x 4 – 20x 2 + 5 = 0
4. 16x 4 – 10x 2 + 5 = 0

Correct answer: 16x 4 – 20x 2 + 5 = 0

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