Q. Determine h′(1) if h(x)=f(g(2−x2)): if g(1)=4, f′(2)=2,
Understand Functions Composition: Understand the composition of functions involved.We have h(x)=f(g(2−x2)). To find h′(1), we need to use the chain rule, which allows us to differentiate composite functions.
Apply Chain Rule: Apply the chain rule to differentiate h(x). The chain rule states that if we have a composite function h(x)=f(g(x)), then h′(x)=f′(g(x))⋅g′(x). In our case, we have an additional layer due to the square root, so we will need to apply the chain rule multiple times.
Differentiate Inner Function: Differentiate the innermost function g(2−x2) with respect to x.g′(2−x2)=−2x⋅g′(2−x2) because the derivative of 2−x2 with respect to x is −2x.
Differentiate Square Root: Differentiate the square root function with respect to its argument.If we have u, where u is a function of x, then the derivative with respect to x is (1/2)⋅u−1/2⋅u′. In our case, u=g(2−x2), so we need to multiply the derivative from Step 3 by (1/2)⋅(g(2−x2))−1/2.
Differentiate Outer Function: Differentiate the outermost function f with respect to its argument.We are given that f′(2)=2, but we need to evaluate f′ at the point g(2−x2). We will use this information later when we plug in the specific values.
Combine Derivatives: Combine the derivatives using the chain rule.h′(x)=f′(g(2−x2))⋅21⋅(g(2−x2))−21⋅(−2x)⋅g′(2−x2)
Evaluate at x=1: Evaluate the derivative at x=1. We need to find the values of g(2−12), g′(2−12), and f′(g(2−12)) to compute h′(1).
Calculate g(2−12): Calculate g(2−12) and g′(2−12). Since g(1)=4, we have g(2−12)=g(1)=4. We are not given g′(2−12), but we can infer that g′(2−12)=g′(1) since 2−12=1. However, we do not have the value of g′(1), so we cannot proceed further with the calculation.
Recognize Missing Information: Recognize the missing information and conclude the problem cannot be solved with the given data.We cannot find h′(1) without knowing g′(1). Therefore, we cannot provide a numerical answer to the question prompt.
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