已知i1=2sin(wt+30 )A,i2= 4sin(wt-45 )A,求i=i1+i2的最大值,要详细过程啊!~~急!
问题描述：
已知i1=2sin(wt+30 )A,i2= 4sin(wt-45 )A,求i=i1+i2的最大值,要详细过程啊!~~急!
答
i=i1+i2=2sin(wt+30º)+4sin(wt-45º)=2(sinwtcos30º+sin30coswt)+4(sinwtcos45º-sin45ºcoswt)=√3sinwt+coswt+2√2sinwt-2√2coswt=(√3+2√2)sinwt+(1-2√2)coswt=√[(√3+2√2)²+(1-...