Full text: Vorlesungen über die Theorie der Wärme (4. Band)

190 Sechzehnte Vorlesung. 
Benutzt man nun die Relationen 
27t 
Jcos cp dcp — 0, 
0 
2 7t 
j cos (90 —{— /3) 9? ===== 0, 
0 
27t 
J*cos cp cos (90 /3) dcp — n cos ß, 
0 
2 7t 
cos 2 {cp -f- ß) dcp — 3t, 
0 
2 ä 
J*cos cp cos 2 (cp -j- ß) dcp — 0, 
h‘> = I* + ^ 2 + £ 2 , 
so findet man hieraus: 
2 Ti 
¿/5,' d/’ + ^ + s,' 2 )^ 
0 
= fe + £ cos2 1) ((li + S cos 2 y) 2 + (i?i + V cos2 y) 2 
+ (§1 + S cos 2 y) 2 + yÄ 2 sin 2 ^'^ 
+ y sin 2 ^(g, + I COS 2 y) (Ä 2 — £ 2 ) — (i? t -f 7] COS 2 y) 
-(e 1 + gcos 2 |')^), 
oder, da 
so ist: 
cos 4 
9' 
cos* 
9' 1 
sin 2 ft', 
¿-J1: d.' 2 + < 2 + s.' 2 ) ¿V 
0 
= (5, + Sco»»£) (l, 2 +i) 1 2 +5, 2 +2(ll,+m+£S, + '|>os 2 |) 
+ sin 2 «■' (/i 2 1, — 6 (II, + n 1J, + £ 5,}) .
	        
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