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Composition of Exponential and Logarithmic Functions

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The functions ff and gg are defined by f(x)=ex2f(x) = e^{\frac{x}{2}} and g(x)=8lnxg(x) = 8\ln x. Which of the following is an expression for the composite function h(x)=(fg)(x)h(x) = (f \circ g)(x) for x>0x > 0?

A

8x2\frac{8x}{2}

B

4lnx4\ln x

C

8ex28e^{\frac{x}{2}}

D

x4x^4

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