Qualification > Queries

AS maths exam after two days..and i'm doomed!!

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sanity_master:
kk :D

nd ur welcome :)

sanity_master:
if u have any other question or u need any help in anything.....dont hesitate to ask :)

mayyoya92:
i just wanted to discuss nov o8 maths pure 1( cie)
it's very hard and tricky especially the vectors question and the wire problem?! [

mayyoya92:
OMG my exam's tomorrow! aaaaaaaaahhhhhhhhh :'( :'( :'( >:( :o :o

nid404:
I just hope I'm not too late

for the wire question
4x+2pir=80
r=80-4x/2pi

Area=x2+pi. r2
substitute 80-4x/2pi for r

x2+(pi X (80-4x)/2pi)2


when u open it u get
x2+ (p X 6400-640+16x2)/ 4pi2
to make denominator same
(4pi x2+ p X 6400-640+16x2)/ 4pi2
reduce...that is divide by 4 and group common terms

(pi+4)2+1600-160/ pi

for the second part

dA/dx= 2x(pi+4)x-160/ pi= 0
solve to get value of x

I will try the vector sum...but I haven't done it in class...so it will take some time

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