Two sides of a triangle are 6 m and 9 m respectively. If the included angle is changing at the rate of 2 radian per second, at what rate is the third side changing when the included angle is 60° ? 9m A. 17.18 m/s B. 11.78 m/s C. 18.17 m/s 6m D. 10.18 m/s

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