fl,«H- (^îH-D?)jH-ci« = Ti

fljX H- ÔjJ -f- (f, H- D?) z = T,.

D?^ H T wD/o: — w* 7 = 0.

D/x + ax— 6cositf(xoos/ir+jsiii/if)= o, 23. j D/V-+-«r — *s'n'»'('2?cos/ir-h78in/i/) = o.

[a = a? cos/ir H- j^ sin/ir, p = j? sin/yr — jcos»/].

(8D? — i7)ar-f-(7D?-88)j-f-59 = o, (5D? - 1 1)^ -f- (4D? - 5a)7 -f- 35 = o.

^ ( (iiD?-.a5):r4.(8D;-36)j^-h73 = o, • I (7D?-i6)x+(5D?-a3)j-h46 = o.

flD^JC H- (c — ^) JZ = o, 29. { ^Df/-h (« — c)za:=o, cDf « -f- (^ — a)arjr = o.

(3i-h9D,)x-H(aH-4Dr)j = ^, (a4 -H 7D,)xH- (i -4- 3Df )/ = 3.