两个数log2sinπ/12和log2cosπ/12的等差中项为______.

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两个数log2sinπ/12和log2cosπ/12的等差中项为______.
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两个数log2sinπ/12和log2cosπ/12的等差中项为______.
两个数log2sinπ/12和log2cosπ/12的等差中项为______.

两个数log2sinπ/12和log2cosπ/12的等差中项为______.
等差中项=(log2sinπ/12+log2cosπ/12)/2
=log2(sinπ/12cosπ/12)/2
=log2(1/2sinπ/6)/2
=log2(1/4)/2
=-2/2
=-1