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Let f(x) = a12x^12+ a10x^10 + a8x^8 +.... +a2x²+a0, where a0, a2....a12 are all real. If there are 3 sign changes in f(x) and f(x) has exactly 4 non-real roots, then which of the following is definitely true?
a0 = 0
a10 > 0
a10 < 0
a10 = 0

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