canister94 wrote: » eq of tangent of circle x1x+y1y=r squared angle between two lines tan theta=m1-m2 over 1=m1m2 perpendicular distance cosine rule cos a+b = cosacosb - sinasinb difference equations un=la power of n +mb power n all your trig proofs then but they are main ones
ladytwink wrote: » Just joined boards having been similarly SCREWED over by maths paper 1 (my strongest out of the 2 papers by far!!!:( Just wondering if anyone could explain the "cos a+b = cosacosb - sinasinb difference equations un=la power of n +mb power n" thoerums or has a link showing them?.. especially the second one please!.. Best of luck to every1 on Mon...judging by paper 1 we're gonna need it!
mtb_kng wrote: » If we know all them, are we sorted, and are there any others that could possibly come up? Spending all day today learning every proof! After yesterday.... I need to do good.
canister94 wrote: » i hae those proofs as document cant upload them
cocopopsxx wrote: » Here are some - Proofs Not all the proofs are there, but it might help.
luciemc wrote: » anyone doing question 9?
cocopopsxx wrote: Thanks a million! I appreciate the help, thanks! xx
PJelly wrote: » Quick silly tangent slope question... You know how the quick way to get the slop of a tangent is -B/A? Well, I thought that the X is always taken as A. So.. 3x-2y+y=o would have a slope of 2/3 But I've got y-2x=0. So I re-arranged it to make 2x-y=0 (multiply across by a minus) so I had a slope of 1/2. But the slope is 2. So they took A as Y and B as X. Are you not able to multiply across by a minus in a tangent? Does that mess up its location completely?
GV_NRG wrote: » do it as Y=Mx + c you have 2x-y=0 -y=-2x y=2x but y=Mx therfore M=2 i hope ive awnsered your question :P
PJelly wrote: » So that's the preferred approach when you have a Y by itself? Thanks loads!:D
canister94 wrote: » minus the coefficient of x over coefficent of y is the easiest
epicwinning wrote: » Ah yes, it's easy to mix this up with the Sum of the Roots formula...
epicwinning wrote: » My class didn't do it but I'll probs try it anyway. Got 26/50 in the Pre in it which is more than what most people were getting for the circle question (and did a victory lap by getting 50/50 in Q8) eh you can't do both 9 and 8!
PJelly wrote: » .... That's a much more sensible way to approach it, than "-B/A" Thank you too God these maths are so relaxing. After yesterday I'd almost forgotten what it feels like to get questions right. Paper 1 almost killed my spirit. Almost.
Shayanzadeh wrote: » It's -A/B not -B/A. So in your 2x-y=0 you would get 2 as slope. Easy to mix up with -B/A which is from alpha + betha.
spazzy wrote: » epicwinning wrote: » My class didn't do it but I'll probs try it anyway. Got 26/50 in the Pre in it which is more than what most people were getting for the circle question (and did a victory lap by getting 50/50 in Q8) eh you can't do both 9 and 8!
epicwinning wrote: » My class didn't do it but I'll probs try it anyway. Got 26/50 in the Pre in it which is more than what most people were getting for the circle question (and did a victory lap by getting 50/50 in Q8)
PJelly wrote: » It's clearly not my day.
epicwinning wrote: » Highest one counts. I'd thought I messed up Q8 completely so I did Q9 as an extra question in the 3-ish minutes I had left in the exam.
