1-2sin²π/12

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1-2sin²π/121-2sin²π/121-2sin²π/121-2sin²π/12=cosπ/6=√3/2

1-2sin²π/12
1-2sin²π/12

1-2sin²π/12
1-2sin²π/12
=cosπ/6
=√3/2