[^82] 
the Sines of the Radical Parts, and multiply thofe parts by 
5 , the refults are alfo roots of the cubick Equation firft 
propofed. 
^ EXAMPLE. 
aaa— iia — ;o 
The cube Roots of the Binomials are ti| tV-| 
Their fumm is the Root fQught==ty 
And the other two Roots are 2|t Vi| 
Alfo in this iEquation a — (Soa -^2__o 
The Binomial Roots are t4 tV-4 
^ 
Hence the Root fought is tg 
And the other two roots are-4t V+ 1 2 
— 4-Vti2. 
jiDFEKJiSEMENT. 
Thefe papers were fent by Mr. Collins to Dr. WaM in a Let- , 
terof 3 o(ioh, 1581, (with this Charadler, I ha^efm you here-.\ 
with my thoughts about fome defetls in Algebra : ) and are a Copy 
ef what he had written to fome other ( but I know not 
whom ) to whom he fpeaks all along in the fecond perfon, 
whereas of others he fpeaks in the third perfon- And he 
did intend ( had he lived longer ) to per fe(3: it further s by 
omitting lome things which ( though here he notes as de- 
feds j he found after to be dpne already, and fupplying 
fome others. But he lived not to perfed: it, and therefore 
{ that it be not loft ) we here give it as we found it. 
O X F O R 
Printed at the THEATER, and are to be fold by Mofes ^itt, 
at the Angel^ and Samuel Smithy at the Princes ^rms in St. 
^aisfs Chmb'^ard LONDON, 1^84. 
