Question

利用三角函数求 7派/6 的三角函数

Answer 1

sin(7π/6)=sin(π+π/6)=-sinπ/6=-1/2

cos7π/6=cos(π+π/6)=-cosπ/6=-根号3/2

tan7π/6=sin7π/6 /cos7π/6=根号3 /3