for . Which expression is ?

Answer and explanation

Correct answer: A.

  1. Step 1: Let , so and .
  2. Step 2: Collect : , so .
  3. Step 3: Swapping the names gives .
Answer
.
Why not the others: Test with : the correct inverse gives and . The option is itself, with ; , and give , and , which maps to , and .

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