Matlab积分报错 syms x y dx dy z t;global e a c;x=acos(t);y=ae*

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Matlab积分报错
syms x y dx dy z t;
global e a c;
x=a*cos(t);y=a*e*(1-cos(t))*sin(t);
dx=diff(x);dy=diff(y);
z=sqrt(dx^2+dy^2);
int(((a*cos(t)+c)^2+(a*e*(1-cos(t))*sin(t))^2)*z,t,0,pi-acos(c/a));
报错为：
Error using mupadmex
Error in MuPAD command:Either base or exponent must be a scalar.
Error in sym/privBinaryOp (line 1694)
Csym = mupadmex(op,args{1}.s,args{2}.s,varargin{:});
Error in sym/mpower (line 194)
B = privBinaryOp(A,p,'symobj::mpower');
Error in one (line 5)
z=sqrt(dx^2+dy^2);

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