it is known that the cost function of an enterprise is C = q3-9q2 + 30g + 25, where C is the cost (unit: thousand dollars), q is the output (unit: T), and the minimum value of average variable cost C (unit: thousand dollars) is obtained.

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

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step-by-step explanation:

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step-by-step explanation: