f(x)=√2/2×cos[2x+(π/4)]+sin²x.
=√2/2cos2x*√2/2-√2/2*sin2x*√2/2+sin²x
=1/2cos2x-1/2sin2x+sin²x
=1/2cos²x-1/2sin²x-1/2sin2x+sin²x
=1/2cos²x+1/2sin²x-1/2sin2x
=1/2-1/2sin2x
=-1/2sin2x+1/2
最小正周期=2π/2=π
f(x)=√2/2×cos[2x+(π/4)]+sin²x.
=√2/2cos2x*√2/2-√2/2*sin2x*√2/2+sin²x
=1/2cos2x-1/2sin2x+sin²x
=1/2cos²x-1/2sin²x-1/2sin2x+sin²x
=1/2cos²x+1/2sin²x-1/2sin2x
=1/2-1/2sin2x
=-1/2sin2x+1/2
最小正周期=2π/2=π