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hey ive seen a few questions that use different definitions of the tk+1 term to get the greatest coefficient the way i was shown u define the tk+1 as nCk and then tk as nCk-1 and then have tk+1/tk >= 1 its a bit weird though cos in the trial there was a question to prove this, and i...

id say just keep reusing the double angle theorem like u did with sin^2 (ie a cubic expansion and then reapplying the double angle theorem and then dealing with the cubic one with a substitution) other than that I can't see anything else except like using one of the even function four unit...

personally I tried adding a bit of human but my teach (who's very experienced said its fine but you'd really be wanting to minimise any word count wasteage) if you've got something better to say, ie pertaining to the dot points, then rather say that and keep the personal/humouristic elements...

yeh answer is 2pi^2 how'd u get it?

oh shit sorry, y axis

By taking cylindrical shells find the volume enclosed in the region enclosed by (x-1)^2 + y^2 = 1 I ended up getting like the integral of x(2x-x^2)^1/2 I couldn't get it. Is my integration shice or is there a trick to these kinds of questions, like 2 semi-circles or something. if...

I'm totally lost. how did u just square the top and then square the tan on the bottom?

integ x secx tanx dx I got: x secx - ln|tan(45 + x/2)| + C 45 being in degrees I'm pretty sure it's right, but am not sure how the book got x secx - ln(secx + tanx) + C Is my answer wrong? How did they get theres? Thanks

Hmm I think i remember a question like this and the teacher said all u can do is approximate the x values. However I have seen questions like this in 4unit, except they are just normal graphs.