[求助]关于Explicit solution could not be found的问题

[haunteagle]

t1 = [26.7 0 23.2 11.5 29.3 32.5 41.5 43.8 29.7 6.3];
t2 = [34.7 20.6 18.6 0 13.4 0 4.5 0 0 0];
t3 = [0 14.2 0 25.2 17.6 38.2 31.2 47.7 54.1 41.6];
t4 = [35.3 36.3 12.4 29.3 0 28.7 0 26.5 54.3 53.2];

t1=t1/10^6;
t2=t2/10^6;
t3=t3/10^6;
t4=t4/10^6;

t1=t1-t3;
t2=t2-t3;
t4=t4-t3;

syms r t c;
for i=1:10
result1 = solve('2 * r * sin(t) * 0.450 + 2 * r * c * t1(i) - 0.450^2 - c^2 * t1(i)^2' ,'2 * r * cos(t) * 0.3 + 2 * r * sin(t) * 0.450 + 2 * r * c * t1(i) - 0.3^2 - 0.450^2 - c^2 * t2(i)^2' ,'2 * r * cos(t) * 0.3 + 2 * r * c * t4(i) - 0.3^2 - c^2 * t4(i)^2');

看源程序文档
R = feval(symengine,'mlfsolve',eqns,vars);
--cut--
if isempty(R)
warning('symbolic:solve:warnmsg3','Explicit solution could not be found.');

这是怎么一回事？



另外我想了解一下，由下面这个方程组，其中a、b、c为未知量，t1、t2、t4为已知量，用solve命令写出来是我上面那种写法么？
(a * cos(b) - 0.000)^2 + (a * sin(b) - 0.450)^2 = (a + c * t1(i))^2
(a * cos(b) - 0.300)^2 + (a * sin(b) - 0.450)^2 = (a + c * t2(i))^2
(a * cos(b) - 0.300)^2 + (a * sin(b) - 0.000)^2 = (a + c * t4(i))^2


谢谢各位