sinπ/12*cosπ/12=?

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sinπ/12*cosπ/12=?sinπ/12*cosπ/12=?sinπ/12*cosπ/12=?原式=(2sinπ/12*cosπ/12)/2=sinπ/6/2=(1/2)/2=1/4

sinπ/12*cosπ/12=?
sinπ/12*cosπ/12=?

sinπ/12*cosπ/12=?
原式=(2sinπ/12*cosπ/12)/2
=sinπ/6/2
=(1/2)/2
=1/4