So part 3, we look at ! This is slightly more complicated as we need to first lay out some formulas that we should know.
Notice how and are quite related here… And we recall we have a trigonometry identity that happens to be that closely related:
Here we have a slight problem with
Recall the method we saw in part 1 and 2…
As you probably guessed, and for , we can refer to the previous results.
We will look at in part 4, and surprise surprise, it will be quite a different appraoch! Let me know if there are any questions.