De l'équation

déduire

tg (a; + ?V) = r (cos fj + ' sin 9)'

2r cos 8 1 r2 +2/' sin 8 + 1

rl — 1 ^ "" 1 r2 — 2r sin 0 -f- 1

Th2u -

Chu =

2Thu 1 ! Th/V

Ch2« + 1 01 4 /Ch2w — 1

Shp+ Sl^ = 2Sli/ 4; <Ch

S1i(m h v) + Sh(// — r) = 2SlmChv, Sh(« -[- w) Sh(M y) 2Shi?Chw, Ch(w | y) + Cb(w — r) = 2CkwCln>l Ch(u + t>) — Ch(w - y) 2ShwShi?;

Slip — Sliç==2Sh^ 77Ch^ t?, ( "hp + CI19 = 2Ch ;) ± 7 Cli ;) 7 7 •

Clip - Ch$ = 2Sli P + q Sli ;; 7 7 ;

Sly; + SI17 p 4- 9

Chp + Chç 2