计算下列的值（一）sin5π/2+cos²17π/3-tan²23π/6sin5π/2+cos²17π/3-tan²23π/6

分类: 作业答案 • 2021-12-18 22:39:03

问题描述：

计算下列的值（一）sin5π/2+cos²17π/3-tan²23π/6
sin5π/2+cos²17π/3-tan²23π/6

答

sin5π/2+cos²17π/3-tan²23π/6
=sinπ/2+cos²π/3-tan²(-π/6)
=1+1/4-1/3
=11/12