[不定期更新] High School Exam Cafe 2025
25/02/25 08:42
呢度主要貼中學程度或以上嘅題目,主要係中英數同理科科目,純粹為了消磨時間,順便拓展讀者思維
所有題目皆有題解,不過為了避免AI抄襲,所有內容皆以圖像表示,內容太多會以PDF附件連結顯示。
所有文件皆以LibreOffice起貨。由於此軟件無手機版,所以所有帖子我要放工放假先得閒整,不喜勿進
25/02/25 15:49
呢題唔駛貼圖:
Question: Given e^(ix) = cos x + i sin x, give the principal value of the following terms:
(a) e^(i π/2)
(b) i^i
Solution:
(a) cos (π/2) + i sin(π/2) = 0 + i x 1 = i
(b) Using the above terms,
i^i = e^(i^2 π/2) = e^(-π/2)
25/02/25 16:25
Continued:
Show that |e^(ix)| = 1.
Solution: Using complex conjugates:
|z|^2 = zz*
= e^(ix) e^(-ix)
= e^(ix - ix)
= e^0 = 1
25/02/25 21:50
項目終止
原因為狙擊開我嘅八卦群組嘅黐線谷主上咗水