Trigonometric Ratios
回答 (1)
2009-05-01 6:27 pm
✔ 最佳答案
Simplify 4tanθ/cos(90-θ) - 1 /sin(90-θ)Sol
4tanθ/cos(90-θ) - 1 /sin(90-θ)
=4tanθ/sinθ - 1 /cosθ
=4(sinθ/cosθ)/sinθ-1/cosθ
=4/cosθ-1/cosθ
=3/cosθ
=3secθ
收錄日期: 2021-04-23 18:27:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090501000051KK00390