Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
Write as a composite of three simple functions.
: do first. The domain of holds the in the domain of whose is in the domain of . Usually .
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The steps. Multiply by and take away ; square; take the reciprocal.
Step 2. The functions. , , .
Answer: .
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