tan 2x

這老師的回覆也太敷衍了吧 XD

4月 10, 2012

蔡若藍

kuso

Proof that cos(2x) = (1-tan (x))/(1+tan (x))   喔，這麼幸運. 好歹人家遇到少女時代耶!!Proof that cos(2x) = (1-tan (x))/(1+tan (x)) which means cos(x) = (1-tan (x/2))/(1+tan (x/2)); Weierstrass t-substitution; Universal substitution; t=tan(x/2)...

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下定決心要努力過生活，結果....

4月 10, 2012

謝語蘭

kuso

"sec^2x - tan^2x = 1" Trigonometry Square relation-2 - YouTube   結果還是在電腦前面度過.... 太中肯拉XDTrigonometry Square relation 2 deduction of sec^2x - tan^2x = 1 with worked out example....

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傳說彩虹的盡頭有黃金，是真的

4月 10, 2012

黃友陽

kuso

Math Refresher: cot 2x = (1/2) [cot x - tan x]   真的有黃金阿XDLemma 1: cot 2x = (1/2)[cot x - tan x] Proof: (1) cot 2x = 1/tan(2x) = cos(2x)/sin(2x) [See here for definition of tan] (2) cos(2x) = cos 2 (x) - sin 2 (x) [See Lemma 3, here] (3) sin(2x) = 2(sin x)(cos x) [See Lemma 2, here] (4) cos(2x)/sin(2x) = [cos 2 ...

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這就是你無法獲得高分的原因

4月 10, 2012

小安

kuso

Examples of Math Problems: Find sin 2x, cos 2x, and tan 2x from the given information. sec x = 8, x       我想我們還是憑實力吧!!                Find sin 2x, cos 2x, and tan 2x from the given information. sec x = 8, x in Quadrant IV....

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杜甫的動畫都出來了，他老人家應該再怎麼想都沒想到吧

4月 10, 2012

謝語竹

kuso

Men's "Boca Classics Original Clothing" Sweater Size 2X Large Navy Blue or Tan | eBay 杜甫本人看到不知做何感想XDMEN'S "BOCA CLASSICS ORIGINAL CLOTHING" SWEATER, SIZE 2X-LARGE NAVY BLUE OR TAN in Clothing, Shoes & Accessories, Men's Clothing, Sweaters | eBay ... This is a listing for a BOCA CLASSICS ORIGINAL CLOTHING Men's 2X Large Sweater....

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這才是真的連鎖反應

4月 10, 2012

張千梅

kuso

SOLE' TAN - Home   太囧了....開車的那個人Sole' Tan - Yorktown Heights, NY. Tanning Salon ... At Sole' Tan there are no membership or set-up fees, no monthly bank drafts fees and no hidden costs. Tanning purchases from Sole' Tan remain on your account for one year from the date your package start...

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