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    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?
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    (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.
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    (Original post by unamed)
    how come? I'm pretty sure it's -2xcosec2x2.
    sorry i read the bit above wrong - your right - thanks.
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    (Original post by amzy2)
    sorry i read the bit above wrong - your right - thanks.
    Oh ok.
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    (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
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    (Original post by amzy2)
    if you had to differentiate sin^2.x would you rewrite it as (sinx)^2 then do chain rule??? thanks
    :yep: So, you'd basically get 2sinxcosx
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    (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.
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    another quick q..... how do you simplify tanx+tan45/1-tanxtan45
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    (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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