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

题目

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

答案

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