已知某二端网络端口电压为u（t）=[<img src="https://nimg.ppkao.com/2019-05/tangling/201905141533575725.jpg?sign=2b9822fe8c1ffafd34e7457c5f0d8d0a&t=62d5754e" />4sin&omega;t+3<img src="https://nimg.ppkao.com/2019-05/tangling/201905141533575725.jpg?sign=2b9822fe8c1ffafd34e7457c5f0d8d0a&t=62d5754e" />sin（&omega;t－180&deg;）]V，流入该网络的电流为i（t）=2<img src="https://nimg.ppkao.com/2019-05/tangling/201905141533575725.jpg?sign=2b9822fe8c1ffafd34e7457c5f0d8d0a&t=62d5754e" />sin&omega;tA、端口电压、电流取关联参考方向，则该网络的有功功率为（）