1.求下列齐次方程的通解:(1)xy'-y-sqrt(y^2)-x^(2)=0;(3)(x^2+y^2)dx-xydy=0;(5)(2xsin(y)/(x)+3ycos(y)/(x))dx-3xcos(y)/(x)dy=0;

1.求下列齐次方程的通解: (1)$xy'-y-\sqrt{y^{2}-x^{2}}=0$; (3)$(x^{2}+y^{2})dx-xydy=0$; (5)$\left(2x\sin\frac{y}{x}+3y\cos\frac{y}{x}\right)dx-3x\cos\frac{y}{x}dy=0$;

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