求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
问题描述：
求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
答
=sinπ/3cos(π/6)+tan(π/4)cos(π/3)
=0/3cos(π/6)+1*（1/2）
=1/2