Is here anyone who can find this.....F(t)=sin ωt+sin 2ωt+sin 4 ωt is periodic or not...

Is here anyone who can find this.....F(t)=sin ωt+sin 2ωt+sin 4 ωt i

1.	Is here anyone who can find this.....F(t)=sin ωt+sin 2ωt+sin 4 ωt is periodic or not...
Answer» because tignometric functions repeat themselves after a fix interval of time.. so it is periodic oviously Why it is periodic........can anybody explain it? It\'s periodic