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  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. ... 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. ... 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

  4. 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. ... 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. 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. ...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. ... 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. ... 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. ... 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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