求值:sin21/4π tan(-23/6π) cos1500°
问题描述:
求值:sin21/4π tan(-23/6π) cos1500°
答
sin21/4π tan(-23/6π) cos1500°
=sin5π/4tanπ/6cos60°
=-sinπ/4*√3/6
=-√2/2*√3/6=-√6/12