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化简①sin(-10π/3),②cos29π/6,③tan(-855°)④sin(17π/6)

题目详情
化简①sin (-10π/3) ,②cos29π/6 ,③tan(-855°)④sin(17π/6)
▼优质解答
答案和解析
1 sin(-π/3)=-1/2
2 -cos(π/6)=-根号3/2
3 tan(135°)=-tan(45°)=-1
4 sin(5π/6)=sin(π/6)=1/2