f(x)=sinx+根号下3cosx
=2*(sinx/2+根号下3cosx/2)
=2sin(x+派/3)
因为-2/pai<=x<=2/pai
所以-派/6<=x+派/3<=5派/6
所以最大值=2*1=2
最小值=2*(-1/2)=-1