If tan@ = n, by using trigonometric identities, express (4 sin@ + 3 cos @)/(cos @-sin@) in terms of n.
P.S. @ is the angle
中三英數問題
2007-03-27 8:05 am
回答 (1)
2007-03-27 8:14 am
✔ 最佳答案
(4 sin@ + 3 cos @) / (cos @-sin@)= (4 sin@/cos@ + 3 cos@/cos@) / (cos@/cos@ - sin@/cos@)
= (4 tan@ + 3) / (1 - tan@)
= (4n + 3) / (1 - n)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070327000051KK00025