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Let 
g(x)=sin(x).
Can we use the mean value theorem to say the equation 
g^(')(x)=(2)/(pi) has a solution where 
0 < x < (pi)/(2) ?
Choose 1 answer:
(A) No, since the function is not differentiable on that interval.
(B) No, since the average rate of change of 
g over the interval 
0 <= x <= (pi)/(2) isn't equal to 
(2)/(pi).
(C) Yes, both conditions for using the mean value theorem have been met.

Let g(x)=sin(x) g(x)=\sin (x) .\newlineCan we use the mean value theorem to say the equation g(x)=2π g^{\prime}(x)=\frac{2}{\pi} has a solution where \( 0

Full solution

Q. Let g(x)=sin(x) g(x)=\sin (x) .\newlineCan we use the mean value theorem to say the equation g(x)=2π g^{\prime}(x)=\frac{2}{\pi} has a solution where 0<x<π2 0<x<\frac{\pi}{2} ?\newlineChoose 11 answer:\newline(A) No, since the function is not differentiable on that interval.\newline(B) No, since the average rate of change of g g over the interval 0xπ2 0 \leq x \leq \frac{\pi}{2} isn't equal to 2π \frac{2}{\pi} .\newline(C) Yes, both conditions for using the mean value theorem have been met.
  1. Recall MVT Conditions: First, let's recall the conditions for the Mean Value Theorem (MVT). The MVT can be applied if the function is continuous on the closed interval [a,b][a, b] and differentiable on the open interval (a,b)(a, b). We need to check if these conditions are met for g(x)=sin(x)g(x) = \sin(x) on the interval [0,π/2][0, \pi/2].
  2. Function Continuity: The function g(x)=sin(x)g(x) = \sin(x) is continuous on the closed interval [0,π2][0, \frac{\pi}{2}] because sine is a continuous function everywhere.
  3. Function Differentiability: The function g(x)=sin(x)g(x) = \sin(x) is differentiable on the open interval (0,π2)(0, \frac{\pi}{2}) because the derivative of sine, which is cosine, exists and is continuous everywhere.
  4. Calculate Average Rate of Change: Now, let's calculate the average rate of change of g(x)=sin(x)g(x) = \sin(x) over the interval [0,π2][0, \frac{\pi}{2}]. The average rate of change is given by g(b)g(a)(ba)\frac{g(b) - g(a)}{(b - a)}, where a=0a = 0 and b=π2b = \frac{\pi}{2}.
  5. Substitute into Formula: Substitute aa and bb into the average rate of change formula to get sin(π2)sin(0)π20=10π2=2π\frac{\sin(\frac{\pi}{2}) - \sin(0)}{\frac{\pi}{2} - 0} = \frac{1 - 0}{\frac{\pi}{2}} = \frac{2}{\pi}.
  6. Verify Average Rate of Change: Since the average rate of change of g(x)g(x) over the interval [0,π2][0, \frac{\pi}{2}] is equal to 2π\frac{2}{\pi}, which is the same as the value given for g(x)g'(x), the second condition for the MVT is also met.
  7. Apply Mean Value Theorem: Both conditions for the Mean Value Theorem are satisfied, so we can conclude that there exists at least one cc in the open interval (0,π2)(0, \frac{\pi}{2}) such that g(c)=2πg'(c) = \frac{2}{\pi}.

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