Are you planning on remembering identities such as: cos(x)=sin(90-x) sin(x)=cos(90-x) sin(-x)=-sin(x) cos(-x)=cos(x) (The bottom two are rather easy to remember)
These are obvious if you know your graphs, learn the graphs not these!
I understand now. I forgot that the domain of t alone is 0 < t < 12, therefore the domain of 4(pi)(t) is 0 < 4(pi)(t) < (48/25)(pi)(t), which is 6.031.
Yeah it's (t-60) because the graph translates from 10 -> 70 and 60 -> 120
If you notice it's a difference of 60 so you write it as 10 < t-60 < 60
Please note: You DONT write it as t+60 which most people would automatically assume because if you look at my boundaries and rearrange it, doing t+60 would give -50 < t < 0
which would you guys say are the hardest c3 papers that have come out so far (except last years) ive basically done all of the gold papers, now looking to fit in a few of the actual papers, which ones are worthwhile doing?
which would you guys say are the hardest c3 papers that have come out so far (except last years) ive basically done all of the gold papers, now looking to fit in a few of the actual papers, which ones are worthwhile doing?
which would you guys say are the hardest c3 papers that have come out so far (except last years) ive basically done all of the gold papers, now looking to fit in a few of the actual papers, which ones are worthwhile doing?
June 2013 is the notorious one. Otherwise take your pick from any after 2013 including IAL and R papers
Anyone know a quick way of remembering all the identities? :]
Firstly you don't really need to know a whole lot, as most are either on the formula sheet or can easily be derived from it eg sin2a isn't on there but sin(a+b) is so you can just do sin(a+a) to get the identity for sin2a. The only ones you really have to know are 1+tan^2 =sec^2 and 1+cot^2 =cosec^2
Firstly you don't really need to know a whole lot, as most are either on the formula sheet or can easily be derived from it eg sin2a isn't on there but sin(a+b) is so you can just do sin(a+a) to get the identity for sin2a. The only ones you really have to know are 1+tan^2 =sec^2 and 1+cot^2 =cosec^2
For "1+tan^2 =sec^2 and 1+cot^2 =cosec^2" I would just recommend remembering sin2x+cos2x=1, and then altering that in the exam for the specific identity needed.
For "1+tan^2 =sec^2 and 1+cot^2 =cosec^2" I would just recommend remembering sin2x+cos2x=1, and then altering that in the exam for the specific identity needed.
Yes it is fairly easy to derive that one as well (just divide by sin^2 or cos^2) I just put that one as a lot of people don't realise that there is even an identity linking them so may not realise to do that in the exam
Can someone help me on question 5)b) ? I don't understand how you can find the lower limit? help? is it a recirpocal? and what is the best way to work out the range? I usually draw a table but it takes too long