LHSNew question:
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(sinx+sin3x+sin5x+sin7x+sin9x)/(cosx+cos3x+cos5x+cos7x+cos9x) = tan5x
Last edited:
LHSNew question:
Show
(sinx+sin3x+sin5x+sin7x+sin9x)/(cosx+cos3x+cos5x+cos7x+cos9x) = tan5x
it used to be in the syllabus but they took it off...Drongoski, are those identities in the HSC course?
I'm talking about,
etc.
Yes = not directly. But if I were doing Ext 2 I will try to add it to my arsenal. Useful in some of the messier derivations in conics (see P89, Cambridge 4U book)^ yes and no. typical exam questions will have part (i) to show the identity and then in part (ii) you use it
This question does not require the use of those formulas.New question:
Show
(sinx+sin3x+sin5x+sin7x+sin9x)/(cosx+cos3x+cos5x+cos7x+cos9x) = tan5x
I'll give it a crack. I remember seeing your solution/hscishard's solution (whichever one of you uploaded the handwritten answer) but can't really remember it LOL. Might not end well.Anyway, new question:
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"hscishard" and "bored of fail", you're not allowed to answer this![]()
It was mineI'll give it a crack. I remember seeing your solution/hscishard's solution (whichever one of you uploaded the handwritten answer) but can't really remember it LOL. Might not end well.
Factorise: 1-(sinx)^10=(1-(sinx)^2)(1+(sinx)^2+(sinx)^4+(sinx)^6+(sinx)^8)Find
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I've noticed that too...Why are uni students dominating this thread?
Nice work...though I was hoping someone would pick it up more in the lines of a geometric series
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What's the likelihood of that appearing in the 4U HSC exam?Find
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Probably like 15% I'd say...What's the likelihood of that appearing in the 4U HSC exam?