问题
解答题
计算:sin215°+cos215°-cos30°tan60°.
答案
sin215°+cos215°-cos30°tan60°
=1-
×3 2
(3分)3
=1-3 2
=-
.(5分)1 2
计算:sin215°+cos215°-cos30°tan60°.
sin215°+cos215°-cos30°tan60°
=1-
×3 2
(3分)3
=1-3 2
=-
.(5分)1 2