https://imgur.com/a/dcmhwE9 Hi, so I came across this in a C3 revision sheet from Physics and Maths tutor and I had completely forgot this even existed. I do Edexcel maths spec and I haven't been able to find any past paper questions on this (except one from June 2006). Does anyone have any/know of any questions on this topic which I could use to practice? Also, this question only uses sin and cos? Could a question be asked using, tan, sec, cosec, cot as well like this? Regards.
You see after a time they have really repetitive format, and you use only a few very key formula to then basically be able to solve any one you come across, its all about practice and being able to see instinctively/by knowledge what to do in your next step
Example of key formula sin^2 + cos^2 = 1 (you can derive squared cosec, squared sec and squared cot from this) sin/cos = tan sin (a+b) = sin a cos b + sin b cos a cos (a+b) = cos a cos b - sin a sin b
It's worth noting that the formula booklet has the equations for (a + b) for all three trigonometric identities
You see after a time they have really repetitive format, and you use only a few very key formula to then basically be able to solve any one you come across, its all about practice and being able to see instinctively/by knowledge what to do in your next step
Hi, thank you for your help but I was refering to specifically questions on acute and obtuse angles like in the picture I have provided. I have done every past paper since 2005 and I have only come across one question from June 2006 (attatched) which are regarding this. (and some other, similar, but not as specific as this one). Fear not, I have not forgotten the whole trigonometry chapter when the exam is on Tuesday!
https://imgur.com/a/dcmhwE9 Hi, so I came across this in a C3 revision sheet from Physics and Maths tutor and I had completely forgot this even existed. I do Edexcel maths spec and I haven't been able to find any past paper questions on this (except one from June 2006). Does anyone have any/know of any questions on this topic which I could use to practice? Also, this question only uses sin and cos? Could a question be asked using, tan, sec, cosec, cot as well like this? Regards.
Yes they could involve any trig ratio. The best place to find questions like this is in the main Edexcel textbook. Do you have a copy? You won't find many in past papers as you've noticed.
Hi, thank you for your help but I was refering to specifically questions on acute and obtuse angles like in the picture I have provided. I have done every past paper since 2005 and I have only come across one question from June 2006 (attatched) which are regarding this. (and some other, similar, but not as specific as this one). Fear not, I have not forgotten the whole trigonometry chapter when the exam is on Tuesday!
Haha, apologies I didn't fully read the question, been revising all day for C3 so I'm a little loopy right now, assumed you were a year 12 trying to get a head start on C3 haha. I wish you luck for the exam.
Yes they could involve any trig ratio. The best place to find questions like this is in the main Edexcel textbook. Do you have a copy? You won't find many in past papers as you've noticed.
Hi, Yes I have a textbook to practice these questions. I just sometimes don’t find the text books as helpful because they don’t always explain how they got their answer and I always use the Model Answers to understand where I went wrong. Is there a reason there are no PPQs on this topic. Is it unlikely to come up?
Hi, Yes I have a textbook to practice these questions. I just sometimes don’t find the text books as helpful because they don’t always explain how they got their answer and I always use the Model Answers to understand where I went wrong. Is there a reason there are no PPQs on this topic. Is it unlikely to come up?
I can't think of any reason why. It's definitely not a popular question type to appear in Edexcel but there's no reason why it wouldn't appear this year.
If you need help with any question on this topic let me know.
This type of question was never directly mentioned in any spec, new or old. Clearly it's not a popular question if you look at past papers but there's no reason why it wouldn't appear in this year's exam, just like any other question type related to this topic.
Hi, thank you for your help but I was refering to specifically questions on acute and obtuse angles like in the picture I have provided. I have done every past paper since 2005 and I have only come across one question from June 2006 (attatched) which are regarding this. (and some other, similar, but not as specific as this one). Fear not, I have not forgotten the whole trigonometry chapter when the exam is on Tuesday!
Question, I did that question in the picture but where did the negative sign come from?
Question, I did that question in the picture but where did the negative sign come from?
Because if you draw the cast diagram, between 270 and 360, cos angles only are positive. Therefore when you work out sinA it is negative because in that segment sin is negative. Then when you do 2sinacosa your overall figure is negative.
Because if you draw the cast diagram, between 270 and 360, cos angles only are positive. Therefore when you work out sinA it is negative because in that segment sin is negative. Then when you do 2sinacosa your overall figure is negative.