赞 snowfoxligh 春芽
共回答了20个问题采纳率：90% 举报
sin²18°+cos45°×tan25°×tan65°+sin72°×cos18°
=sin²18°+cos45°×tan25°×cot25°+sin72°×cos18°
=sin²18°+cos45°×1+cos18°×cos18°
=sin²18°+cos45°×1+cos²18°
=1+cos45°
=1+二分之根号二
=sin²18°+cos45°×tan25°×cot25°+sin72°×cos18°
=sin²18°+cos45°×1+cos18°×cos18°
=sin²18°+cos45°×1+cos²18°
=1+cos45°
=1+二分之根号二
1年前
2
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