358 



NOTE ON THE INTERSECTION OF TWO CURVES. 



I 



In Figure 2, two hyperbolas are drawn, • — r= i -|- y3 cos 0, 



2)' 



^ 3 . . . . 



— = I H sin 0, intersecting in four points. Equation (A) 



2r 2V2 



liere gives two intersections of / -f~ with // -|-> ^i — i^ot cuttin 



/ — , and equation (B) gives two intersections of / — Avith // -\-, 

 II — not cutting / -)-, the corresponding pairs being joined by 

 dotted lines, as before. In the figure II — is not drawn. Since 

 here / = I', the common chord through the intersections of / 4" 



