Primera coordenada baricéntrica de Z, centro de perspectividad de ABC y UVW.

 a^2 (a+b-c) (a-b+c) ((a+b+c) Sqrt[-a^4-(b^2-c^2)^2+2 a^2 (b^2+c^2)] (a^20-2 a^19 (b+c)-4 a^18 (b^2-3 b c+c^2)+2 a^17 (b+c) (13 b^2-22 b c+13 c^2)-8 a^15 (b+c) (8 b^4-18 b^3 c+19 b^2 c^2-18 b c^3+8 c^4)-a^16 (21 b^4+48 b^3 c-70 b^2 c^2+48 b c^3+21 c^4)-8 a^14 (5 b^6-38 b^5 c+22 b^4 c^2-2 b^3 c^3+22 b^2 c^4-38 b c^5+5 c^6)+8 a^13 (b+c) (46 b^6-98 b^5 c+79 b^4 c^2-58 b^3 c^3+79 b^2 c^4-98 b c^5+46 c^6)-4 a^11 (b-c)^2 (b+c) (293 b^6-66 b^5 c+81 b^4 c^2+120 b^3 c^3+81 b^2 c^4-66 b c^5+293 c^6)+8 a^5 (b-c)^4 (b+c)^3 (12 b^8-130 b^7 c+19 b^6 c^2-386 b^5 c^3-134 b^4 c^4-386 b^3 c^5+19 b^2 c^6-130 b c^7+12 c^8)+2 a (b-c)^6 (b+c)^5 (17 b^8-4 b^7 c+32 b^6 c^2+4 b^5 c^3+158 b^4 c^4+4 b^3 c^5+32 b^2 c^6-4 b c^7+17 c^8)+8 a^10 (b-c)^2 (42 b^8+261 b^7 c+131 b^6 c^2+39 b^5 c^3+174 b^4 c^4+39 b^3 c^5+131 b^2 c^6+261 b c^7+42 c^8)+2 a^12 (65 b^8-488 b^7 c+424 b^6 c^2+152 b^5 c^3-370 b^4 c^4+152 b^3 c^5+424 b^2 c^6-488 b c^7+65 c^8)+4 a^9 (b-c)^2 (b+c) (381 b^8-240 b^7 c+110 b^6 c^2+256 b^5 c^3+74 b^4 c^4+256 b^3 c^5+110 b^2 c^6-240 b c^7+381 c^8)-4 a^2 (b^2-c^2)^4 (3 b^10-3 b^9 c+33 b^8 c^2+252 b^6 c^4-58 b^5 c^5+252 b^4 c^6+33 b^2 c^8-3 b c^9+3 c^10)-(b-c)^6 (b+c)^4 (9 b^10+18 b^9 c+17 b^8 c^2+80 b^7 c^3+166 b^6 c^4+444 b^5 c^5+166 b^4 c^6+80 b^3 c^7+17 b^2 c^8+18 b c^9+9 c^10)-2 a^3 (b-c)^4 (b+c)^3 (13 b^10-142 b^9 c-67 b^8 c^2-496 b^7 c^3-458 b^6 c^4-772 b^5 c^5-458 b^4 c^6-496 b^3 c^7-67 b^2 c^8-142 b c^9+13 c^10)+8 a^6 (b^2-c^2)^2 (93 b^10+38 b^9 c-136 b^8 c^2+298 b^7 c^3-373 b^6 c^4+416 b^5 c^5-373 b^4 c^6+298 b^3 c^7-136 b^2 c^8+38 b c^9+93 c^10)-8 a^7 (b-c)^2 (b+c) (98 b^10-186 b^9 c+39 b^8 c^2-6 b^7 c^3-9 b^6 c^4+384 b^5 c^5-9 b^4 c^6-6 b^3 c^7+39 b^2 c^8-186 b c^9+98 c^10)-a^4 (b-c)^4 (b+c)^2 (147 b^10+342 b^9 c+191 b^8 c^2+440 b^7 c^3-1106 b^6 c^4-1564 b^5 c^5-1106 b^4 c^6+440 b^3 c^7+191 b^2 c^8+342 b c^9+147 c^10)-2 a^8 (b-c)^2 (489 b^10+1466 b^9 c+429 b^8 c^2+360 b^7 c^3+842 b^6 c^4-4 b^5 c^5+842 b^4 c^6+360 b^3 c^7+429 b^2 c^8+1466 b c^9+489 c^10))+(2 (-a+b+c)^2 (a^24-3 a^23 (b+c)-3 a^22 (b^2+c^2)+a^21 (b+c) (13 b^2+10 b c+13 c^2)+a^19 (b+c) (7 b^4-116 b^3 c+54 b^2 c^2-116 b c^3+7 c^4)+a^20 (7 b^4+2 b^3 c-14 b^2 c^2+2 b c^3+7 c^4)+a^18 (-113 b^6+36 b^5 c+125 b^4 c^2-80 b^3 c^3+125 b^2 c^4+36 b c^5-113 c^6)+2 (b-c)^10 (b+c)^8 (2 b^6-3 b^5 c+6 b^4 c^2-26 b^3 c^3+6 b^2 c^4-3 b c^5+2 c^6)-a^17 (b+c) (105 b^6-362 b^5 c+323 b^4 c^2-532 b^3 c^3+323 b^2 c^4-362 b c^5+105 c^6)+2 a^15 (b+c) (41 b^8-120 b^7 c-60 b^6 c^2+376 b^5 c^3-634 b^4 c^4+376 b^3 c^5-60 b^2 c^6-120 b c^7+41 c^8)+2 a^13 (b-c)^2 (b+c) (217 b^8-36 b^7 c+1052 b^6 c^2-892 b^5 c^3+54 b^4 c^4-892 b^3 c^5+1052 b^2 c^6-36 b c^7+217 c^8)+2 a^16 (311 b^8-91 b^7 c-214 b^6 c^2+75 b^5 c^3-2 b^4 c^4+75 b^3 c^5-214 b^2 c^6-91 b c^7+311 c^8)+2 a^14 (-807 b^10+120 b^9 c+621 b^8 c^2-464 b^7 c^3+346 b^6 c^4+112 b^5 c^5+346 b^4 c^6-464 b^3 c^7+621 b^2 c^8+120 b c^9-807 c^10)-a (b-c)^8 (b+c)^5 (5 b^10+34 b^9 c+29 b^8 c^2-64 b^7 c^3-226 b^6 c^4-580 b^5 c^5-226 b^4 c^6-64 b^3 c^7+29 b^2 c^8+34 b c^9+5 c^10)-a^2 (b-c)^8 (b+c)^4 (13 b^10-48 b^9 c-123 b^8 c^2-312 b^7 c^3-82 b^6 c^4-432 b^5 c^5-82 b^4 c^6-312 b^3 c^7-123 b^2 c^8-48 b c^9+13 c^10)-a^3 (b-c)^8 (b+c)^3 (21 b^10-14 b^9 c+165 b^8 c^2+656 b^7 c^3+1414 b^6 c^4+1404 b^5 c^5+1414 b^4 c^6+656 b^3 c^7+165 b^2 c^8-14 b c^9+21 c^10)-2 a^11 (b-c)^2 (b+c) (609 b^10-34 b^9 c+2233 b^8 c^2-1024 b^7 c^3+422 b^6 c^4-2108 b^5 c^5+422 b^4 c^6-1024 b^3 c^7+2233 b^2 c^8-34 b c^9+609 c^10)+2 a^12 (b-c)^2 (1183 b^10+2416 b^9 c+2303 b^8 c^2+3480 b^7 c^3+3618 b^6 c^4+3184 b^5 c^5+3618 b^4 c^6+3480 b^3 c^7+2303 b^2 c^8+2416 b c^9+1183 c^10)+a^4 (b^2-c^2)^4 (43 b^12-230 b^11 c+430 b^10 c^2-1422 b^9 c^3+1093 b^8 c^4-6028 b^7 c^5+4036 b^6 c^6-6028 b^5 c^7+1093 b^4 c^8-1422 b^3 c^9+430 b^2 c^10-230 b c^11+43 c^12)+a^5 (b-c)^4 (b+c)^3 (273 b^12-124 b^11 c+1650 b^10 c^2-1228 b^9 c^3+3551 b^8 c^4-2744 b^7 c^5+9532 b^6 c^6-2744 b^5 c^7+3551 b^4 c^8-1228 b^3 c^9+1650 b^2 c^10-124 b c^11+273 c^12)-a^6 (b-c)^4 (b+c)^2 (287 b^12+462 b^11 c+818 b^10 c^2-1770 b^9 c^3-4639 b^8 c^4-6884 b^7 c^5-11364 b^6 c^6-6884 b^5 c^7-4639 b^4 c^8-1770 b^3 c^9+818 b^2 c^10+462 b c^11+287 c^12)+2 a^9 (b-c)^2 (b+c) (719 b^12+16 b^11 c+2386 b^10 c^2-576 b^9 c^3+2257 b^8 c^4-1616 b^7 c^5-4324 b^6 c^6-1616 b^5 c^7+2257 b^4 c^8-576 b^3 c^9+2386 b^2 c^10+16 b c^11+719 c^12)-a^7 (b-c)^4 (b+c) (895 b^12+1772 b^11 c+5550 b^10 c^2+8060 b^9 c^3+15249 b^8 c^4+21656 b^7 c^5+21636 b^6 c^6+21656 b^5 c^7+15249 b^4 c^8+8060 b^3 c^9+5550 b^2 c^10+1772 b c^11+895 c^12)-2 a^10 (b-c)^2 (1033 b^12+2310 b^11 c+1858 b^10 c^2+2142 b^9 c^3+2055 b^8 c^4+3868 b^7 c^5+6236 b^6 c^6+3868 b^5 c^7+2055 b^4 c^8+2142 b^3 c^9+1858 b^2 c^10+2310 b c^11+1033 c^12)+a^8 (b^2-c^2)^2 (1053 b^12+324 b^11 c-134 b^10 c^2-1612 b^9 c^3-685 b^8 c^4+7432 b^7 c^5-4564 b^6 c^6+7432 b^5 c^7-685 b^4 c^8-1612 b^3 c^9-134 b^2 c^10+324 b c^11+1053 c^12)))/((a-b-c) (a^2+(b-c)^2-2 a (b+c))))