== (41) = 

 deindc pro Q habcbiLiir hacc aeqiiatio: 



— iQQrzAT' — 3 xjy — (x x -Hj^j)' idcoqiic 



Simih"qiie modo multitiido valoriim idoncorum pro P ct Q 

 Tlterius augcri potcft. Quin etiam, fi fumcre vclimus «r-yt, crit 

 i p p — : h -t- , fiuc 



« p P - ^ _i_ ' — x-hVixx-hy y I 



>-x-hyy V{xx-i-yyl xx-hyy 



vnde fit 



''^ 2[xx-i-yy} ' 



deinde vcro crit 



^4.0 Q= — ! — ^ — j.^- — ^ — -.. ^' . ■: ' 



^^^ x-t-j'»'— 1 X — yy — I nxx-H^j) xx-hyy Vixx-t-j^,) 



vndc fir 



§. 65. Omnes autcm has formulas multo concinnius 

 pcr multiplicationcm angulorum cxhibcre liccbit. Si cnim po- 

 namus y ( jt j: -f-.y^ y ~ x: , ct dcrotct angulum, cuius tan- 

 gcns -^ , erit .r = 2 cof. (p et .r ~ s fin. (P^ quibus valoribus 



fubrtitutis, fi funclio F denotct potcftatcm cxponentis ;/, erit 



P-Is'*(cof.Cp-f-y-ifin.Cp)"-f-^:;'^(cor.(p-/-ifin.(|))% 



quac formuhi pcr notas reducliones praebct P~ ^s" cof. « C|5. 

 Similique modo ex forma 



Q.— ^ ^__ (cof. Cp-h/— I fm.cpy 



(cof (p — y _ I fin. (bY 



2 V — I ' 



Noua Acta Aiad. Imp. Sc. T. I. F pro- 



