3tan² 15° tan² 75°=?
回答 (1)
2017-08-11 3:52 pm
3 tan² 15° tan² 75°
= 3 tan² 15° cot² 15°
= 3 (tan 15° cot 15°)²
= 3
= 3 tan² 15° cot² 15°
= 3 (tan 15° cot 15°)²
= 3
收錄日期: 2021-04-26 15:45:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170811072158AA5WUPp