Q COS

sm nz

cos nz n — I

/•"— ' cos nz n — 2

( cos z )"

(cos z)" — n- ^ (cosz'/"’ (sinz)’

\ / sin z n — i n — 2 /sin z

+ etc. ) = /• ( n n X — ^ X ( )

/ \ cos z 2 3 \ cos z J

+ elc.) (,„ï=ix(!îîS-')‘ + etc.)] =

n tang z — n

I n — 2 flangz)

PRINCIPES MATHIîMymQUES ,

»— W— 5 ^ n — \ ^ (tang zŸ

— etc. ^ ^ I

(tangr)* , n a „5

X^ y l^-elc.).