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1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0.2),2)
i1=I1sinωt,i2=I2sin(3ωt+60°),求i1+i2 u1=U1sin(ωt+45°),u2=U2sin(ωt-45°),求u1-u2 i1=I1sin(ωt+30°),i1=I2sin(3ωt-30°),求i1-i2 以上三式均可
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0.2),2)
1/2 ; 1; (2)1/2/2 ; (3)1/2/2 。
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