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a = sin 36° is a root of which of the following? 

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a = sin 36° is a root of which of the following? 

(a) 16x4 - 10x2 + 5 = 0

(b) 16x4 + 20x2 - 5 = 0

(c) 16x4 - 20x2 + 5 = 0

(d) 16x4 - 10x2 - 5 = 0

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(c) 16x4 - 20x2 + 5 = 0

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