The one of the (approximate) values of c in [0,4] such that f′(c)=f(4)−f(0)4 for the function f(x)=2x+cos(2πx−6)−5 is
Question
The one of the (approximate) values of c in [0,4] such that f′(c)=f(4)−f(0)4 for the function f(x)=2x+cos(2πx−6)−5 is
Solution
This problem is an application of the Mean Value Theorem (MVT) in calculus. The MVT states that if a function is continuous on the interval [a, b] and differentiable on the open interval (a, b), then there exists at least one number c in the interval (a, b) such that the derivative of the function at c equals the average rate of change of the function over the interval [a, b].
Here, we are given the function f(x) = 2x + cos(2πx - 6) - 5 and we are asked to find the value of c in the interval [0, 4] such that f′(c) = (f(4) - f(0))/4.
Step 1: Compute f(4) and f(0) f(4) = 24 + cos(2π4 - 6) - 5 = 8 + cos(2π) - 5 = 8 + 1 - 5 = 4 f(0) = 20 + cos(2π0 - 6) - 5 = 0 + cos(-6) - 5 = -5 + cos(-6)
Step 2: Compute (f(4) - f(0))/4 (f(4) - f(0))/4 = (4 - (-5 + cos(-6)))/4 = (4 + 5 - cos(6))/4 = (9 - cos(6))/4
Step 3: Compute the derivative of f(x) f′(x) = 2 - 2π*sin(2πx - 6)
Step 4: Set f′(c) equal to (f(4) - f(0))/4 and solve for c 2 - 2π*sin(2πc - 6) = (9 - cos(6))/4
This equation can be solved numerically to find the approximate value of c.
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