作业帮cos²25°+sin²25°-tan21°cot21°×tan45°
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/14 21:45:33
cos²25°+sin²25°-tan21°cot21°×tan45°
cos²25°+sin²25°-tan21°cot21°×tan45°
cos²25°+sin²25°-tan21°cot21°×tan45°
cos²25°+sin²25°-tan21°cot21°×tan45°
=1-1x1
=1-1
=0
cos²25°+sin²25°-tan21°cot21°×tan45°
=1-1
=0
cos²25°+sin²25°-tan21°cot21°×tan45°
＝（cos²25°+sin²25°）-（tan21°cot21°）×tan45°
＝1-1×1
＝1-1
＝0