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# C3 exponential function watch

1. isnt the question y=(cotx)^2? so i assume you use the chain rule? i remember in my text book there was one for y=(sinx)^2 and it said to use the chain rule and you get 2sinxcosx, i applied the same rule..how did u get your answer?
2. (Original post by amzy2)
isnt the question y=(cotx)^2? so i assume you use the chain rule? i remember in my text book there was one for y=(sinx)^2 and it said to use the chain rule and you get 2sinxcosx, i applied the same rule..how did u get your answer?
I though the question was: cot(x2)
which is why I got the -2xcosec2x2
if it was (cotx)2, then yes, we would use the chain rule.
3. (Original post by unamed)
how come? I'm pretty sure it's -2xcosec2x2.
sorry i read the bit above wrong - your right - thanks.
4. (Original post by amzy2)
sorry i read the bit above wrong - your right - thanks.
Oh ok.
5. (Original post by unamed)
Oh ok.
if you had to differentiate sin^2.x would you rewrite it as (sinx)^2 then do chain rule??? thanks
6. (Original post by amzy2)
if you had to differentiate sin^2.x would you rewrite it as (sinx)^2 then do chain rule??? thanks
So, you'd basically get 2sinxcosx
7. (Original post by amzy2)
if im not wrong its: -2cotxcosec^2.x using the chain rule on (cotx)^2 leting u=cotx and y=u^2

Thats what I thought it was but according to the markscheme its wrong.
8. another quick q..... how do you simplify tanx+tan45/1-tanxtan45
9. (Original post by skk90)
another quick q..... how do you simplify tanx+tan45/1-tanxtan45
that's tan(x+45) {unless you wanted us to simplify it further}
it'll be tanx+1/1-tanx [tan45 being 1]

was your original question (cotx)2 or cotx2?

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