题目内容
cos25°+cos215°+cos225°+cos235°+cos245°+cos255°+cos265°+cos275°+cos285°=__________.
4
解析：原式=（cos25°+sin25°）+（cos215°+sin215°）+（cos225°+sin225°）+（cos235°+sin235°）+
=4
.
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导学教程高中新课标系列答案题目内容
cos25°+cos215°+cos225°+cos235°+cos245°+cos255°+cos265°+cos275°+cos285°=__________.
4
解析：原式=（cos25°+sin25°）+（cos215°+sin215°）+（cos225°+sin225°）+（cos235°+sin235°）+=4.
导学教程高中新课标系列答案