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One side of a triangle is increasing at a rate of 9 cm/s and a second...

One side of a triangle is increasing at a rate of 9 cm/s and a second side is decreasing at a rate of 7 cm/s. If the area of the triangle remains constant, at what rate does the angle between the sides change when the first side is 22 cm long, the second side is 31 cm, and the angle is π/3? (Round your answer to three decimal places.)

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