请问用maple怎么进行这样的符号计算？

solve({(sin(a)*x4+cos(a)*sin(b)*y4+cos(a)*cos(b)*z4+f)^2+(cos(b)*y4-sin(b)*z4+e)^2 = R^2, (sin(a)*x3+cos(a)*sin(b)*y3+cos(a)*cos(b)*z3+f)^2+(cos(b)*y3-sin(b)*z3+e)^2 = R2, (sin(a)*x2+cos(a)*sin(b)*y2+cos(a)*cos(b)*z2+f)^2+(cos(b)*y2-sin(b)*z2+e)^2 = R^2, (sin(a)*x1+cos(a)*sin(b)*y1+cos(a)*cos(b)*z1+f)^2+(cos(b)*y1-sin(b)*z1+e)^2 = R^2}, {n, e, f, m})
运行总是几十秒就停止了，怎么回事？请高手解答下