If f(x) = ex and g(x) = loge x then the value of fog(1) is

  1. 0
  2. 1
  3. -1
  4. None of these

Answer (Detailed Solution Below)

Option 2 : 1
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Detailed Solution

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Concept: 

Composition of function: Let f, and g be any functions then, f ∘ g(x) = f[g(x)]

 

Calculations:

Given, f(x) = ex and g(x) = loge x

Now, f ∘ g(x) = f[g(x)]

= eg(x)

= eloge x

= x                (∵ eloge x = x)

f ∘ g(x) = x

Put x = 1, we get

fog(1) = 1

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