Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
Use an identity to find each value.
, , , , and if then .
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. (a). .
Step 2. (b). .
Step 3. (c). .
Answer: , and .
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