IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: *-*Sizzy*-* on April 20, 2010, 10:22:50 pm

Title: math p1 o/n 05 DOUBT
Post by: *-*Sizzy*-* on April 20, 2010, 10:22:50 pm

can any one solve 9 iii) i did the rest of the question just part iii) is a lil confusin....:S
Thanks in advance!!! ;)

Title: Re: math p1 o/n 05 DOUBT
Post by: nid404 on April 21, 2010, 06:58:24 am

Basically you find the the two tangents

for 2x+y=10
m=-2

for 12/x
dy/dx= -12/x²

m= -3

also because tan theta= m
for eq 1
theta= tan^-1 (-2)
       = -63.4(negative sign is cuz of the direction) =63.4
for eq 2
theta= tan^-1 (-3)
       =-71.6=71.6
angle between them would be the difference...
Draw graphically if u don't understand
    71.6-63.4=8.2 degrees

Title: Re: math p1 o/n 05 DOUBT
Post by: *-*Sizzy*-* on April 22, 2010, 02:59:55 pm

thanx!!!i got it nw!!!Thanks loadz!!!  ;D

Title: Re: math p1 o/n 05 DOUBT
Post by: nid404 on April 22, 2010, 04:27:47 pm

Quote from: *-*Sizzy*-* on April 22, 2010, 02:59:55 pm

thanx!!!i got it nw!!!Thanks loadz!!!  ;D

anytime

Title: Re: math p1 o/n 05 DOUBT
Post by: Amr Fouad on April 22, 2010, 04:48:55 pm

Awesome Nid..As always

+rep.

Title: Re: math p1 o/n 05 DOUBT
Post by: nid404 on April 22, 2010, 04:50:38 pm

Quote from: ~ A.F ~ on April 22, 2010, 04:48:55 pm

Awesome Nid..As always

+rep.

Thank you

Thanks for the rep tho