[ 35 ° ] 
. , _ _ _ __ tyy _ ttyy _ ± tt =p xx tnn 
44. DTr;~ — r-^-r — — . 
px ccx x frn 
dt ~ 
pxx c c xx cc+yy cmm 
ty tty 
fn 
/ Ct ^ cm c — 
4c. an n ( X AT ~ ) X t — *=— X / — 
J \ ct nx n J 
/ ct \ cm 
an — l x a T zr ) — xt -\- x . 
\ ct nx 
m. 
46. vn rr ^ 
p vXf/_ / — * 
PC ~ T 
f C 
T TC \ JC fC — 
x — x ~ = ) — x t — x~—x f — m 
x n nx nm J 
*Jz<V — c c X tt — ; 
UN — C / =- 
' XV CCX’W It ZV 
cc 
X /- s/tt XV 
47. AD - ( ± AC + CD - ± / + r) X ± / + 
av> - (AC + c yX f+ 
m. 
48. Produce pf, pf % fo meet the curve in n, ir j 
Draw n A perpendicular to a a. 
Put Fn — z\ fn — v\ fAz*', 
Now, FD ~ (±CF + CDz) ±i f qr x — dz.f q 
r r . tm tv—— cc 
/&=/+— = __. 
tm tz — ce 
7~ f 
Then fA— — (cA — cfzt ) y — f — xt~x' — f — ) 
/a - f Y tm — tqj ' — cc 
J J f f * 
cr—ti 
f 
49. Froi* 
