已知函数f(x)=cos^x-sin^x+2倍的根号3sinxcosx+1

f(x)=cos^x-sin^x+2倍的根号3sinxcosx+1
=cos2x+√3sin2x+1
=2sin(2x+30°)+1
(1)T=2pai/2=π
f(x)min=-2+1=-1
(2)2sin(2x+30°)+1=2
sin(2x+30°)=1/2
2x+30°=150°
x=60°