Q. Let g(x)=sin(x).Can we use the mean value theorem to say the equation g′(x)=π2 has a solution where 0<x<2π ?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≤2π isn't equal to π2.(C) Yes, both conditions for using the mean value theorem have been met.
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] and differentiable on the open interval (a,b). We need to check if these conditions are met for g(x)=sin(x) on the interval [0,π/2].
Function Continuity: The function g(x)=sin(x) is continuous on the closed interval [0,2π] because sine is a continuous function everywhere.
Function Differentiability: The function g(x)=sin(x) is differentiable on the open interval (0,2π) because the derivative of sine, which is cosine, exists and is continuous everywhere.
Calculate Average Rate of Change: Now, let's calculate the average rate of change of g(x)=sin(x) over the interval [0,2π]. The average rate of change is given by (b−a)g(b)−g(a), where a=0 and b=2π.
Substitute into Formula: Substitute a and b into the average rate of change formula to get 2π−0sin(2π)−sin(0)=2π1−0=π2.
Verify Average Rate of Change: Since the average rate of change of g(x) over the interval [0,2π] is equal to π2, which is the same as the value given for g′(x), the second condition for the MVT is also met.
Apply Mean Value Theorem: Both conditions for the Mean Value Theorem are satisfied, so we can conclude that there exists at least one c in the open interval (0,2π) such that g′(c)=π2.
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