(1)-103rad/s时 H(j)=7 2+1 =1∠-36.9 1+j2 由式(12-6)求得 u2(t)）Hjo)川U1mcos[ot+41+θ(o】 =1×10V2c0s103t+10°-36.9°)V =10W2c0s103t-26.9°)V (2)0F104rad/s时 02 HG0)= 2+j10 =0.102∠-89.8 U,-98+j20(1) =103rad/s时    1 36.9 1 j2 2 j1 (j ) 1 2       U U H  由式(12－6)求得 10 2 cos(10 26.9 )V 1 10 2 cos(10 10 36.9 )V ( ) | (j ) | cos[ ( )] 3 3 2 1m 1             t t u t H  U t    (2) =104rad/s时    0.102 89.8 98 j20 2 j10 ( j ) 1 2        U U H 