sin²π/8-cos²π/8= 1/sin10`-√3/cos10`=
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sin²π/8-cos²π/8= 1/sin10`-√3/cos10`=
sin²π/8-cos²π/8=
1/sin10`-√3/cos10`=
sin²π/8-cos²π/8= 1/sin10`-√3/cos10`=
由cos2α=cos²α-sin²α
原式=cosπ/4=√2÷2