请问拉格朗日方程组的解法问题
方程如下：=dsolve('D2x*cos(y)-2*Dx*Dy*sin(y)+0.54*sin(x)+0.0254*cos(0.48*t)*sin(x)=0','D2y+(Dx)^2*sin(y)*cos(y)+0.54*cos(x)*sin(y)+0.127*cos(y)+0.0254*cos(x)*sin(y)=0','t')。我是matlab的菜鸟，用dsolve解这个方程组，计算了一会儿，matlab自动关闭了。。。哪位大虾能帮帮我？应该怎么解呢？
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