更新1:
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Suppose that sin(t) = -1/4 and that the endpoint of t is in the 4th quadrant. Find cos (t) and tan (t)?
回答 (1)
2015-07-01 5:01 pm
✔ 最佳答案
sinθ = -¼cos²θ = 1-sin²θ = 15/16
Since θ is in quadrant IV, cosθ > 0.
cosθ = √(15/16) = √15/4
tanθ = sinθ/cosθ = -1/√15 = -√15/15
收錄日期: 2021-04-21 11:43:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150701083310AAZGTu3