Average Rate of Change of a Function
What is the average rate of change of $$\displaystyle m(x) = 2\cos(x) - \sin(x)$$ over the interval $$\displaystyle \left[0, \frac{\pi}{2}\right]$$?
A
$$\displaystyle -\frac{6}{\pi}$$
B
$$\displaystyle -\frac{3}{\pi}$$
C
$$\displaystyle -\frac{\pi}{6}$$
D
$$\displaystyle \frac{6}{\pi}$$
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