cos5/picos5/2pi的值等于

山情-海情2022-10-04 11:39:541条回答

cos5/picos5/2pi的值等于
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hyboy1012 共回答了17个问题 | 采纳率94.1%
cosπ/5cos2π/5=2sinπ/5cosπ/5cos2π/5/(2sinπ/5)=sin2π/5cos2π/5/(2sinπ/5)=2sin2π/5cos2π/5/(4sinπ/5)=sin4π/5/(4sinπ/5)=sin(π-π/5)/(4sinπ/5)=sinπ/5/(4sinπ/5)=1/4
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