4 sinπ/12 cosπ/12=

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4sinπ/12cosπ/12=4sinπ/12cosπ/12=4sinπ/12cosπ/12=4sinπ/12cosπ/12=2sinπ/6=2×1/2=1全部展开收起

4 sinπ/12 cosπ/12=
4 sinπ/12 cosπ/12=

4 sinπ/12 cosπ/12=
4 sinπ/12 cosπ/12=2sinπ/6=2×1/2=1

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