tan 2x = cot x

河馬拉屎好霸氣啊，一定要躲遠點才行！

11月 12, 2011

范姜慕秋

kuso

Tan(π/2-x)= Cot(x) 101 Guide for Dummies - YouTube In this video we show you the proof for Tan(π/2-x)= Cot(x). So you can impress your class, teacher, and various girlfriends........

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原來如此！重點是人啊！！

11月 13, 2011

范姜慕秋

kuso

SOLUTION: can you please prove this identity (tan x - cot x) / (tan^2 x - cot^2 x)= sin x cos x原來如此！重點是人啊！！You can put this solution on YOUR website! (tan x - cot x) / (tan^2 x - cot^2 x)= sin x cos x.. start with left side (tan x - cot x) / (tan^2 x - cot^2 x) difference of squares (tan x - cot x) / (tan x - cot x)(tan x + cot x) 1/(tan x + cot x) 1/((sinx/co...

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捕獲一隻狂派間碟，正在拷問中 . . . .

11月 13, 2011

林凝晴

kuso

*simplify this trig function? (1 + tan^2x)/(csc^2x) - YouTube捕獲一隻狂派間碟，正在拷問中 . . . .A http://www.door2math.com production. This video-answer was posted in less than 10 minutes after the question was asked....

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中午吃啥 番茄醬吃到飽 . . .

11月 13, 2011

張易旋

kuso

Difference between arctan(x) and cot(x) | Physics Forums - The Fusion of Science and Community中午吃啥? 番茄醬吃到飽 . . .Just to clarify, that notation doesn't mean the multiplicative inverse in this context, but the inverse function. [tex]tan(x)=y[/tex] [tex]Arctan(y)=x[/tex] With whatever restrictions are necessary so that those are functions and not just relations....

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神在創造牠的時候，可能心情不太好。。。

11月 13, 2011

張憶曼

kuso

6-3 Double-Angle and Half-Angle Identities Section 6-3 Double-Angle and Half-Angle Identities神在創造牠的時候，可能心情不太好。。。Explore/Discuss 2 6-3 Double-Angle and Half-Angle Identities475 and 5 1 1 cos x, since 1 1 cos x is never negative. All absolute value signs can be dropped, since it can be shown that tan (x/2) and sin x always have the same sign (a good exercise for you)...

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兒子表示：不要問，很恐怖 . . . .

11月 13, 2011

劉秋曼

kuso

Math Forum: Ask Dr. Math FAQ: Trigonometry Formulas兒子表示：不要問，很恐怖 . . . .[Back to Contents] Inverse Trigonometric Functions x = Arcsin(y) ==> y = sin(x), - /2...

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