ao+, y=A sin(at+)=v2Asin(at+o) 方法2对一阶电路方程两边取相量法正变换 door+a1Y=A∠ A A∠0 J0+a, (a0)2+a2∠-1a p-tan-1d@ an0 +a 取相量法反变换 24 yn()=p() sin(ot +o-tan 0a (a0)2+方法2 对一阶电路方程两边取相量法正变换 0 1 a j Y a Y A   + =  0 1 2 2 1 0 0 1 1 1 0 2 2 1 0 1 ( ) tan tan ( ) A A Y a j a a a a a A a a a a         − −  =  = + +  =  − + 取相量法反变换 1 1 0 2 2 1 0 1 2 ( ) ( ) sin( tan ) ( ) p A a y t phj Y t a a a     − − = = + − + 0 1 sin( ) 2 sin( ) m dy a a y A t A t dt + = + = +    