Average Rate of Change of a Function

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What is the average rate of change of $\displaystyle m(x) = 2\cos(x) - \sin(x)$ over the interval $\displaystyle \left[0, \frac{\pi}{2}\right]$ ?

$\displaystyle -\frac{6}{\pi}$

$\displaystyle -\frac{3}{\pi}$

$\displaystyle -\frac{\pi}{6}$

$\displaystyle \frac{6}{\pi}$

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Rank	User	Correct Count	Attempt Count	Total Time	Score
#1	furtadoeu2403	0	1	0m 03s	-13
#2	manyab1708	0	2	0m 00s	-20
#3	psak12	0	1	2m 49s	-179
#4	srinikasriyamathur	1	2	48m 13s	-2,803

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