In a triangle A B C, if a is the arithmetic mean and b, c(b ≠ c) are two geometric means between,...

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In a triangle A B C, if a is the arithmetic mean and b, c(b ≠ c) are two geometric means between, any two positive real numbers then sin ^3 B+sin ^3 C/sin A sin B sin C is equal to
(a) 0
(b) 1
(c) 2

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