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OCR MEI C2 Mathematics [June 3rd 2015]

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Thank you! Though I still don't really get it :frown:

I think if I could memorise sin cos and tan graphs I'd be alright but I never can and we don't get one in the exam! I've never used that CAST diagram before so I'm not really sure what you did with it :3
It's not so much the 2x I struggled with, it's actually finding the range for all questions like this. Thank you for your help :smile:

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You're welcome! :smile:

As there's only a few days to go, I think it's better to stick with using the graphs to work out the solutions. The tan graph is not an easy one to remember. The sin and cos graphs have the same shape, but sin starts at 0, and cos starts at 1 (you could do sin^-1 0 / cos^-1 0 on your calculator to get the start values if you found yourself getting mixed up).

It's worth trying to remember the graphs and when you start the exam, write them down immediately (perhaps on an extra sheet of paper) once the exam has started. Then, if you need them, you will have them to hand.

Reply 21

M.C. Math

Original post by bethknott

Thank you! Though I still don't really get it :frown:

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Hi bethknott

I've reposted my earlier solution, but using the graph to work out the values (hope it's not too small to read!). The symmetry of the graph can be used to work out the second values, and if additional values were needed, the values repeat every 360 degrees on the sin/cos graphs (one complete cycle).

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Reply 22

bethknott

Original post by M.C. Math

Thank you very much :smile:

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Reply 23

Gemma01

hi
can someone explain question 6 on June 2012 paper please? i am struggling on log :frown:

Reply 24

Gemma01

can someone explain question 6 on june 2012 paper please?

Reply 25

Supergirlxxxxxx

Anyone know how figure out this question? Can't believe I sat this paper 2 years ago and failed it in the exam, here I am not knowing it still! :O ImageUploadedByStudent Room1432822893.529135.jpg

ImageUploadedByStudent Room1432822893.529135.jpg

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Reply 26

M.C. Math

Original post by Supergirlxxxxxx

Anyone know how figure out this question? Can't believe I sat this paper 2 years ago and failed it in the exam, here I am not knowing it still! :O ImageUploadedByStudent Room1432822893.529135.jpg

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Hi. I've attached a solution. These kind of questions can be tough!

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Reply 27

Supergirlxxxxxx

Original post by M.C. Math

Hi. I've attached a solution. These kind of questions can be tough!

Thank you so much! I really appreciate it , I shall go through this tonight :smile:

) just hope this kind of question doesn't appear on Wednesday!

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Reply 28

M.C. Math

Original post by Supergirlxxxxxx

Thank you so much! I really appreciate it , I shall go through this tonight :smile:

) just hope this kind of question doesn't appear on Wednesday!

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Good luck!

Just out of interest, do you what exam board was the question from? Thanks.

Reply 29

Supergirlxxxxxx

Original post by M.C. Math

Good luck!

Just out of interest, do you what exam board was the question from? Thanks.

Haha well we're on an OCR MEI thread so it's that :smile:

it's June 2013

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Reply 30

M.C. Math

Oops; it's been a long day!!

Thanks for the paper reference.

Reply 31

Gemma01

hi could you help me on question 6, june 2012 paper please

Reply 32

1997_1997

Hi guys,
I'm a bit stuck on this question for C2, could any of you help. I just don't get the end bit.

Showing your method clearly, solve the equation

5 sin2q = 5 + cos q for 0◦ ≤ q ≤ 360◦.

So basically, I can solve it till the point where you have to find the remaining values.

This is what I have done, please help guys!

Thanks

(edited 8 years ago)

Reply 33

Alex621

Original post by 1997_1997

Hi guys,
I'm a bit stuck on this question for C2, could any of you help. I just don't get the end bit.

So basically, I can solve it till the point where you have to find the remaining values.

This is what I have done, please help guys!

Thanks

If you draw a cos graph, then mark the points where y=-1/5 it should help you to visually see where the solutions are, and where you've got cos(x)=0, x=90 and 270 but not 0 because arccos(0)=1

Reply 34

Slenderman

Can someone please post some sort of tutorial on how to answer those questions where you need to prove something is a decreasing or increasing function and can someone post the solution for the log question in the 2014 paper (I haven't got the link). I don't see how the answer goes to cos(3)

Reply 35

lucye7

does anyone have any tips for remembering the trig functions of 30, 45, 60, 90, 180 etc?

Reply 36

Aph

Original post by lucye7

does anyone have any tips for remembering the trig functions of 30, 45, 60, 90, 180 etc?

Unit triangles.

Reply 37

1997_1997

Original post by AlexParmenter

If you draw a cos graph, then mark the points where y=-1/5 it should help you to visually see where the solutions are, and where you've got cos(x)=0, x=90 and 270 but not 0 because arccos(0)=1

Thank you,

I've drawn the graph, but how do you know if you add 180 to it or minus from 360?

Reply 38

Supergirlxxxxxx

I hope sequences as the last question doesn't come up :frown:

worth 13 marks argh

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Reply 39

M.C. Math

Original post by Gemma01

hi could you help me on question 6, june 2012 paper please

Hi Gemma01.

Here's a solution to that question. I found it easier to find the equation of the line, then map the log x and log y onto the answer, than doing it direct.