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1. ### x=sec(theta), find maximum value of ((x^2 - 2)^2)/x^4 , x>=1?

x = sec(θ) ∴ |x| ≧ 1 ∴ x^2 - 1 = tan^2(θ)    (x^2-1)/x^2 = sin^2(θ) (x^2-2)^2/x^4 = [(x^2-1)/x^2-1/x^2]^2    = (sin^2(θ) -1/x^2)^2    ≦ (max{sin^2(θ),1/x^2})^2 (*)    ≦ 1 關於 (*): a, b 均非負, 則     |a-b| = max{a-b,b-a} ≦ max{a,b} 故     (a-b)^2 ≦ (max{a,b})^2 等號僅成立於 a, b 兩者其一為 0. 若 max{sin^2(θ),1/x^2} = sin^2(θ...

分類：科學及數學 > 數學 2021年01月02日

2. ### 急!My dream school 作文?

... school should be using , applying good textbooks for me to digest without exaninations...school mates should be my good fellows... ---And it is the accomplishment...

分類：社會及文化 > 語言 2020年11月20日

3. ### 數學嘅解同埋證明應該幾時寫？

... are calculators powerful enough to solve the problems. But you are not allowed to use it .) 2. Yes. At the minimum, in case of an incorrect answer, you still get some...

分類：科學及數學 > 數學 2020年10月01日

The only way is to re-install via factory restore partition or USB flash drive. Note - upgrade option must be done within the Windows system it is trying to upgrade. So what you see is normal.

5. ### 何謂“chifi"？？？？！！！！?

... from article on The Verge “Online, the phenomenon is known as “Chi-fi” — a mashup of “Chinese” and “high-fidelity.” It ’s usually used to refer to portable audio gear — they’re almost always earbuds, …”

分類：音樂 > 其他 - 音樂 2020年06月22日

6. ### 一條物理問題(邊個好心人答岩,我會比晒5粒星), thx!!?

Ref. gravity formula:  If Mass same, New r is 1/3R. new g will be 1/(1/3R)^2 more or about x9 times more than original planet.

分類：科學及數學 > 物理學 2020年05月19日

7. ### How to learn knowledge well in university,and how to make a good academic racord?

...because you are bound to forget. Try to draw a chat on the particular topic within the subject you are studying it , it helps on exam revision too. Use Revision Aid, such as Flash...

8. ### My sister maths problem, how to do, thanks?

... home. (b) From 9 a.m. to 1 p.m. there were 4 hours. It is given that x = 1.5 and...for 0.5 hour, so y = 4 - 1.5 - 0.5 = 2. Using the result of part (a), at 1 p.m. ...

分類：科學及數學 > 數學 2020年02月19日

9. ### 求幫手英文作文，要初中程度二百字。急!謝謝?

... at the place treated it as a winter holiday resort and festival. The vistors were asked to sign their names...a food token worth \$400.00. for use at the Hotel or a ...

分類：社會及文化 > 語言 2020年01月16日

10. ### 「法律角度問題」自助洗衣店洗好衣服後被其他人取出的問題？

... is about reasonableness. It is reasonable for Customer (A) to occupy the machine when it is used by Customer (A). But once the washing is ...

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