sin 2x = cos x

測驗你是不是海綿寶寶中毒者

3月 2, 2012

劉安竹

kuso

Trig Identities: cos^2(2x) + sin^2(2x), os^2(x)-1/sin(x),   如果認得出來誰是誰 你中毒太深了XDI've done a few problems on a homework assignment related to Trig identities, but I can't figure out how to simplify some problems. I have the identities in front of me, but I can't see how they can be applied. I missed class when we went over them. 4. co...

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原來臉書上的朋友...

3月 2, 2012

連元柳

kuso

Integration of trig functions: int sin^2 x cos^4 x dx 有時候只是點個讚罷了!!XD\int sin^2xcos^4xdx \int(1-cos^2x)(cos^4x) \int(cos^4x-cos^6x)dx \cos^2 x = \frac {1 + \cos 2x}2 \frac{1}{2}\int cos^4xdx-\frac{1}{2}\int cos^6xdx...

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把電腦借給女朋友之後.....

3月 2, 2012

劉安竹

kuso

Derivatives of sin x, cos x, tan x, e^x and ln x | Derivatives of common functions | Khan Academy   真實故事!Learn the derivatives of several common functions. ... tan(2x) - cot(2x) = sin(2x)/cos(2x) - (cos(2x)/sin(2x)) Find and use a common denominator: = [sin^2(2x) - cos^2(2x)] / sin(2x)cos(2x) Remember that `cos(2a) = cos^2(a) - sin^2(a)`...

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這就是傳說中雞排中的王者

3月 2, 2012

張憶曼

kuso

Example: sin cos xdx - MIT OpenCourseWare | Free Online Course Materials   吃到天荒地老、海枯石爛!sin2 x cos 2 x = (sin x cos x)2 1 2 = 2 sin(2x) = 1 4 sin2(2x) = 1 1 − cos(4x) 4 2 sin2 x cos 2 x = 1 8 − cos(4x) 8 Using the double angle formula for the sine function reduces the number of factors of sin x and cos x, but not quite far enough; it leaves ...

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觔斗雲

3月 1, 2012

張易旋

kuso

*Trig Equation: sin(2x) + cosx =0, sin(3x) = -1/2 for x btw 0, 2*pi - YouTube  翻下床應該很痛> A http://www.door2math.com production. solve Trig Equation: sin(2x) + cosx =0, sin(3x) = -1/2 for x btw 0, 2*pi....

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中肯

3月 1, 2012

蔡若藍

kuso

Integral of sin(x)*cos(x) - YouTube 真的是這樣嘛!?How to integrate sin(x)*cos(x)? which is the correct answer??? solution playlist page http://www.blackpenredpen.com/math/Ca... trig integrals, trigonometric integrals, integral of sin(x), integral of tan(x), integral of sec(x), James Stewart single variab...

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