Trigonometric Question (further maths/uni level) HELP!!!! Watch

h_y
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Hi




I've attached them in a file
Doc1.docx
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TeeEm
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(Original post by h_y)
Hi

I'm struggling with how to explain this but will do my best! I'm doing a self-taught? course to get into university through open awards. I'm not sure if many of you are familiar with it but I basically don' have any teachers or tutors so when I get stuck I turn to revision guides and mainly online help.

I've got a May exam coming up on trigonometric methods and in all the practice questions I've gathered there are 2 that I am completely stuck on and can not do. So I would appreciate any help anyone can give me at all.

I've been trying to set up the questions with the LaTeX method but I keep messing it up! They are long(ish) so if anyone wants to have a go at them could you please just post below and i'll PM them you straight away! They are higher then A-level math questions (as in the difficulty wise) so i'll say around university level? I'm not 100 percent on that though.

Thank you for reading and thanks for any help! -H
no need for LaTeX
Post a photo is the quickest way
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h_y
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(Original post by TeeEm)
no need for LaTeX
Post a photo is the quickest way
thanks I'll do it now...................



done i think it's right
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User1443542
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I'll try and have a crack at some of them. I'm doing Edexcel FM, so maybe
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h_y
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(Original post by devangdave)
I'll try and have a crack at some of them. I'm doing Edexcel FM, so maybe
Thank you I've attached a doc file with the questions
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TeeEm
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(Original post by h_y)
thanks I'll do it now...................



done i think it's right
the first two are very standard A level questions and most people here would be able to help you.

the last one is challenging but look at Q352 in this link
(very long time to download)

http://madasmaths.com/archive/maths_..._questions.pdf

I did the solution to practically the same question.
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h_y
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(Original post by TeeEm)
the first two are very standard A level questions and most people here would be able to help you.

the last one is challenging but look at Q352 in this link
(very long time to download)

http://madasmaths.com/archive/maths_..._questions.pdf

I did the solution to practically the same question.
Thanks for having a look at it

Do you mean question 18? cause I haven't come across a question like that so i have nothing to refer back to and don't know where to start. Thanks for that i'm going to check it out now
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TeeEm
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(Original post by h_y)
Thanks for having a look at it

Do you mean question 18? cause I haven't come across a question like that so i have nothing to refer back to and don't know where to start. Thanks for that i'm going to check it out now
I very busy at present
for Q18 look at similar questions on
http://madasmaths.com/archive/maths_...formations.pdf
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h_y
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(Original post by TeeEm)
I very busy at present
for Q18 look at similar questions on
http://madasmaths.com/archive/maths_...formations.pdf
No worries Thanks for them links they look really helpful. I'm going to spend time now and go through and have another go at it Hopefully will get somewhere with it
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h_y
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(Original post by TeeEm)
the first two are very standard A level questions and most people here would be able to help you.

the last one is challenging but look at Q352 in this link
(very long time to download)

http://madasmaths.com/archive/maths_..._questions.pdf

I did the solution to practically the same question.
Hi You know that link you posted and you said have a look at question 352? I still don't know what i'm doing there. Thanks
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TeeEm
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(Original post by h_y)
Hi You know that link you posted and you said have a look at question 352? I still don't know what i'm doing there. Thanks
Well the question has a full solution and it assumes you know all the standard trig identities.

what course are you on and what is your mathematical background?
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h_y
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(Original post by TeeEm)
Well the question has a full solution and it assumes you know all the standard trig identities.

what course are you on and what is your mathematical background?
...........
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TeeEm
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(Original post by h_y)
I'm doing a access to medical health professions course. Which include a maths, physics and biology module. My maths is poor in Russia I've done the equivalent to half a maths A-level so an 'as' in maths I think it's called. But that's about it.
That may explain why you find this so hard.

I would love to help but I am tied up with my own work at present and it seems that the room is dead (Friday night + Football).

Hopefully later or tomorrow some of the regulars here might be able to help but my advice is to discuss these with your course tutor or borough/buy an A level textbook which covers trigonometry at A2 level and self study.

I hope it all goes well.
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h_y
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(Original post by TeeEm)
That may explain why you find this so hard.

I would love to help but I am tied up with my own work at present and it seems that the room is dead (Friday night + Football).

Hopefully later or tomorrow some of the regulars here might be able to help but my advice is to discuss these with your course tutor or borough/buy an A level textbook which covers trigonometry at A2 level and self study.

I hope it all goes well.
no worries, thank you for your help though
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ghostwalker
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(Original post by h_y)
...
Q19.

From \sin2P+\sin 2Q + \sin 2R

Obvious first step is the double angle formula.

Then, we want to use P+Q+R=pi. We have a choice of changing the sine or the cosine. One leads us to the desired result, and the other to another result.

In this case changing the sine works:

Now \sin x = \sin (\pi-x) for all x.

So, \sin P = \sin (\pi-[Q+R])= \sin(Q+R)

Applying that three times and expanding the \sin(Q+R) etc., we end up with:

=4(\sin P \cos Q \cos R + \cos P\sin Q\cos R+ \cos P \cos Q \sin R)

We now want to start combining the P,Q,R, so we can exploit the P+Q+R=pi.

Looking at the first two terms we get:

=4(\sin (P+Q) \cos R + \cos P \cos Q \sin R)

Now we want to construct sin (P+Q+R), so we need cos(P+Q)sin(R) out of that second term. Clearly it's not there as is, so we need to add (and subtract so nothing changes) a term, which is sinPsinQsinR.

Can you finish - save me doing all the LaTex.
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