S^ I TT

(3) dn(nw) = (-iy' 7-T-x„.,Jj[dn(a-+-aj^v),

>, Ti, Tj, . . . , Trt-i ; V = o, Ti, Tj, . . . , r„i I "ticulier rt = 2, rj = 4, . . . , r^-i = 2(71 — i) J

(4) sn(nu) = n snu 1 1 j-; — - — ^'^ , ,

dn'aji,v sn*a

(d) cn(nu) = cna I I 7- — ^' ,

Ar'cn^aM vsn*a I — '^'

(6) dn(nu) = dnaTT ,, , ^^-^ , ,

(9) (A')"'"'-rj''"''''^-

fA = o, V = r,, rt, ...,r„

FORMULES

XC (fin).

(10) /i sn(/ia) r= N^ 5n(M -^- ssar,,).

(ri) ( — 1) * ncn(nu) — ^ cn(a h- aar,*),

(i'2) (—1) * n dn( /iM) = ^ cln(a-T- 2a;.,,),

en particulier

r ^^ /'o, Ti, .... /'n-i ; s — Sq^ 5|, ...» 5^—1 \

fer ; r„ — 5o — o, r^ — s^ —\, . . . , /'«-t — S/,t =-- n — ij