cos²25°+sin²25°-tan21°cot21°×tan45°

来源：学生作业学帮网编辑：学帮网时间：2024/05/14 10:21:51

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