cos²25°+sin²25°-tan21°cot21°×tan45°
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/08 09:01:12
cos²25°+sin²25°-tan21°cot21°×tan45°cos²25°+sin²25°-tan21°cot21°×tan45°cos²2
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