Originally Posted by
dd86 Wow OK. I did not come across this in my self-study so far...
Geometric/Taylor/Maclaurin series, that's what you need for this problem.
So what this means is that when I multiply a binomial expansion with cos x, I have to differentiate the binomial expansion?
No, you replace
with its Maclaurin expansion, which is:
What if it was cos 2x or cos3x or cos -x?
Then you change each of those with their equivalent Maclaurin expansions.
What about sin ax and tan ax?
Same for those too.
It would be great if anyone could just give me the link to read up on this. I'm still a novice so something that's easy to understand would be preferable. But I will post questions if I don't understand
Probably
wikipedia can't be bettered in this case.
I'd also like to know whether I can read up on how to find the rth term in a binomial expansion? I have found myself to be weak in this part for many of the questions I have come across.
You only need the
factorial definition of the coefficients and the binomial theorem to do that. Do a bit of search to find further explanations.