sin(2x+45)=cos(60-x)成立最小正角

问题描述:

sin(2x+45)=cos(60-x)成立最小正角

sin(2x+45)=cos(60-x)=sin(90-60+x)=sin(30+x)
→2x+45=30+x
→x=-15
→x=-15+360=345

sin(2x+45)=cos(60-x)=sin(90-60+x)=sin(30+x)=sin(180-30-x)=sin(150-x)
2x+45=150-x
x=35度