sin²π/8 -cos²π/8

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sin²π/8-cos²π/8sin²π/8-cos²π/8sin²π/8-cos²π/8sin²(π/8)-cos²(

sin²π/8 -cos²π/8
sin²π/8 -cos²π/8

sin²π/8 -cos²π/8
sin²(π/8) -cos²(π/8)
=-cos(2*π/8)
=-cos(π/4)
=-√2/2