Can somebody please help me find the limit of the trigonometric function? THANK YOU?
回答 (1)
2016-09-03 4:37 am
✔ 最佳答案
cos (4θ) * tan (4θ) / θ= cos (4θ) * [ sin (4θ) / cos (4θ) ] / θ
= sin (4θ) / θ
Let u = 4θ
If θ → 0 , then u → 0
sin (4θ) / θ
= sin u / ( u / 4 )
= 4 * sin u / u
→ 4 * 1
= 4 ..... Ans
收錄日期: 2021-05-02 14:11:46
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