sin 2x cos 2x 1

科技始終來自於人性...

2月 8, 2012

連元柳

kuso

verify the identity cos^2x - sin^2x = 2cos^2x - 1? | Yahoo Answers那甲甲呢? 2008/1/29 ·  Verify the identity cos^2x - sin^2x = 2cos^2x - 1? Follow 10 answers 10 Report Abuse Are you sure you ......

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的確該好好反省啊！

2月 8, 2012

陳巧芹

kuso

How to prove the identity `sin^2x + cos^2x = 1` ? | eNotes原來不是只有星爺電影裡會出現這種事...可以轉貼笨版了! Get an answer for 'How to prove the identity `sin^2x + cos^2x = 1` ?' and find homework help for other ......

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強中自有強中手！

2月 8, 2012

連冷文

kuso

cos^2x - sin^2x / 1 - tan^2x = ? | Yahoo Answers好像挺方便的，不過感覺有點噁... 2009/4/14 ·  Best Answer: Use the double angle formulae, and your other trigonometric identities... If tan x = 1/2, ......

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分享 笑臉耶

2月 7, 2012

范姜慕秋

kuso

Does 1 - sin^2x = cos^2x? | Physics Forums - The Fusion of Science and Community 是不是超卡娃宜呢!Does 1 - sin^2x = cos^2x? Jan 25, 2012 #1 bobsmith76 1. The problem statement, all variables and ......

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分享 迴魂針人

2月 7, 2012

黃如筠

kuso

Sin^2x=1/2(1-Cos2x) - Math Central SO Q!!!!Sin^2x=1/2(1-Cos2x) and then explain where this identity would be useful??? Hi Chris, When I see this ......

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分享 這...小偷爬過去不但被刺死 衣服也劃的亂七八糟了吧

2月 7, 2012

何憶青

kuso

Prove that sin^2x = 1/2 (1-cos2x)? - Quora 不過整體還蠻可愛的:DFirst, cos 2x = cos (x + x) = cos x (cos x) - sin x (sin x) = (cos x)^2 - (sin x)^2. Now, (cos x)^2 = 1 - ......

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