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AMC (AIMO validation set) / The graph of y=x²+2x−15 intersects the x-axis at points A and C and the y-axis at point B. What is the numerator of the simplest fraction that represents tan(∠ABC)? · Discussion

Discussing The graph of y=x²+2x−15 intersects the x-axis at points A and C and the y-axis at point B. What is the numerator of the simplest fraction that represents tan(∠ABC)? · AMC (AIMO validation set)

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