Matlab - solución de sistema de ecuaciones

x1*cos(x4)-120*(x2-4)*cos(x3)=0

x1*sin(x4)+120*(x2-4)*sin(x3)-150=0

x2^2-78+84*cos(x4)=0

x2-6*sin(x4)/sin(x3)=0

clear

syms x1 x2 x3 x4

ecu1=x1*cos(x4)-120*(x2-4)*cos(x3)==0;

ecu2=x1*sin(x4)+120*(x2-4)*sin(x3)-150==0;

ecu3=x2^2-78+84*cos(x4)==0;

ecu4=x2-6*sin(x4)/sin(x3)==0;

[x1, x2, x3, x4] = solve([ecu1 ecu2 ecu3 ecu4], [x1 x2 x3 x4],'IgnoreAnalyticConstraints', true)

>> solver13

Warning: Unable to solve symbolically. Returning a numeric approximation instead.

> In solve (line 304)

  In solver13 (line 7)

x1 =

-1354.4446648672988981876835209116

x2 =

-6.201208838207596927824789134039

x3 =

38.72202230692258167868489108933

x4 =

74.317595135571833808576876180456