计算sin²π/8-cos²π/8=

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计算sin²π/8-cos²π/8=计算sin²π/8-cos²π/8=计算sin²π/8-cos²π/8=sin²π/8-cos

计算sin²π/8-cos²π/8=
计算sin²π/8-cos²π/8=

计算sin²π/8-cos²π/8=
sin²π/8-cos²π/8
=-cos(2*π/8)
=-√2/2

sin²π/8-cos²π/8=-cos(π/4)=-√2/2