sinπ/8cosπ/8根据什么公式计算?
2个回答
根据两倍角公式sin2a=2sinacosa
sinπ/8cosπ/8
=(1/2)*2sinπ/8cosπ/8
=(1/2)*sinπ/4
=(1/2)*(√2/2)
=√2/4
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