π/6

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π/6
π/6

π/6
∵π/6

cos(a-π/6)=15/17，因为π/6cosa
=cos[(a-π/6)+π/6]
=cos(a-π/6)cosπ/6-sin(a-π/6)sinπ/6
=15/17*√3/2-8/17*1/2
=(15√3-8)/34

π/6 π/6 π/6 Sin(π+π/6)Sin(2π+π/6)Sin(3π+π/6).Sin(2008π+π/6)求值设-π/6 计算：sinπ/6+cosπ/6+tanπ/6+cotπ/6 当π/6 已知π/6 已知π/6 已知π/6 sin 11π/6 已知π/6 COS13/6π 已知π/6 已知π比6 已知π/6 6π约等于 sin25π/6等于?