作业帮为什么cos5π/12等于sinπ/12
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为什么cos5π/12等于sinπ/12
为什么cos5π/12等于sinπ/12
为什么cos5π/12等于sinπ/12
构造直角三角形ABC
C=π/2,B=5π/12,A=π/12
sinπ/12=sinA=对边/斜边=BC/AB
cos5π/12=cosB=邻边/斜边=BC/AB
故cos5π/12等于sinπ/12
cos5π/12=sin(π/2-5π/12)=sin（π/12）
5π/12+π/12=π/2
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