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EXAMPLE 5Differentiating a Composite Function

Suppose h=fg. Find h(1) given that: f(1)=2f(1)=1f(2)=4g(1)=2g(1)=3g(2)=5

Solution Based on the Chain Rule using prime notation, we have h(x0)=(fg)(x0)=f(g(x0))g(x0)

When x0=1, h(1)=f(g(1))g(1)=g(1)=2;g(1)=3f(2)(3)=f(2)=4(4)(3)=12