Suppose a triangle has sides a, b, and c, and let be the angle opposite the side of length a. If cos < 0, what must be true?

b^2 + c^2 > a^2

a^2 + b^2 = c^2

b^2 + c^2 < a^2

a^2 + b^2 > c^2

would it be A?

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