SCott 6eit ^toitctiomn Ut Stu^tl 14t 



(tt + uu) finC}) cof A = frfin(J) cof X — 2trcot<p — zruüncp finX, 



9Ux «-»-«« = rr— «2«r— -? — 2rafaagX 

 colX 



ober auch « + «« = rr — 2tr-^_ — zrwtangX, 



tang(^ 



wnb Mcfe ©fcicbung crgicbt/ t)a^ bie ^^ro|cctton wiebetum i« bte 



€(a|]NJ bcr ^llipfcn 5«l>^'^0 bie auä) Wx eini^rcieJ ivitb» 



5D?an otbne nnmHc^^ bic ©reic^^uns nat^ b^it .^otcnjc» 



f>on «, fo l;at man atf-h2r«fangX+tt-+-— -^-t— rr = #» 



tang(p 



5(uf bet Sbenc beträfe! fci? bie ^tojection PK (13^15.) 

 gexcicl)nct/ unb GH i)U ^unbamcntallinie/ T bet Slugciipunct/ 

 TW = f, WK = «. 9}?an fe^ct = o, fo wirb aw+zrufangX — rr 

 = 0, otfo tt = — rtangX + rfecX» ^an nel)nie bcmnac^ TD 

 = — rfaugX, DP =+rfecX, DQ.=: — rfecX, fo (icgen bie ^Nuncfe 

 P unb GL in t)a ^rojccfion. ^an jicl)c EF mit GH paralkf, uuö 

 nad[)bcm WK bi$ Wuerldnciert worbcu/ fci^ WKria-, fo wix^ 

 rrrrjangX + M, a(fo»=2- — rtangX. S)ic§ in bic üoriflc &ku 

 ^ung jnjifcl[)cn «unb «gefegt/ giebUtt>ifd[^cn Dtt; = t, unbfüK=Ä 

 bicfc Q5Icic^ung 



r^— 2rxtangX+mangX* + tt + —~-t ^ rr zz§, -j- ar^angX 



taiig(^ ° 



— 2rf tangX^ 



ober 2:2:— rrCtangX^" -j- 1) ^- «t + ^fJf 2^t = o. 



tang(|) 



^Ur\ fe^c r=o, fo l)at man « + ^^^i^t = rrfecXS U4ib biei 



tang(J) 



gicbt t=— ?!?£--»- rfecX cofec(p. 5Rimmt man bemnad[) DC 



= — t:!^^^, CE= + rfecXcofecCl), CF=— rfecXcofec(|), fo jinD 



(^ 3 bie 



