f(x)=cos2x+1+sin2x=根号2sin(2x+Pai/4)+1
最小正周期T=2Pai/2=Pai.
g(x)=f(x)+f(x+Pai/4)=根号2sin(2x+Pai/4)+1+根号2sin(2x+Pai/2+Pai/4)+1
=根号2sin(2x+Pai/4)+cos(2x+Pai/4)+2
=2sin(2x+Pai/4+Pai/4)+2
=2cos2x+2
-1
f(x)=cos2x+1+sin2x=根号2sin(2x+Pai/4)+1
最小正周期T=2Pai/2=Pai.
g(x)=f(x)+f(x+Pai/4)=根号2sin(2x+Pai/4)+1+根号2sin(2x+Pai/2+Pai/4)+1
=根号2sin(2x+Pai/4)+cos(2x+Pai/4)+2
=2sin(2x+Pai/4+Pai/4)+2
=2cos2x+2
-1