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(Compiled with Asymptote version 2.14svn-r5318) |
import geometry; size(10cm); point C=(4,2); dot("$C$",C,E+NE,red); hyperbola h=hyperbola(C,1.5,1,-20); draw(h, linewidth(bp)); /* View the definition of line tangent(hyperbola,abscissa) */ line l=tangent(h,angabscissa(85)); draw(l, grey); dot(intersectionpoints(h,l)); l=tangent(h,angabscissa(0,fromCenter)); draw(l, grey); dot(intersectionpoints(h,l)); // Enlarge the bounding box of the current picture. draw(box((-1,-0.5), (9,4)), invisible);