User:Feb30th1712

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My albums, blogs and bookmarks.

Currently reading 計算機概論第六版({{ISBN|986-421-565-5}}).

Math

Image:Unit_circle_angles.svg]]

$\frac {d}{d \theta} \sin \theta = \cos \theta$

$\frac {d}{d \theta} \cos \theta = - \sin \theta$

$\frac {d}{d \theta} \tan \theta = \sec^2 \theta$

$\frac {d}{d \theta} \cot \theta = - \csc^2 \theta$

$\frac {d}{d \theta} \sec \theta = \sec \theta \tan \theta$

$\frac {d}{d \theta} \csc \theta = - \csc \theta \cot \theta$

$\cos2\theta = \cos^2 \theta - \sin^2 \theta=2 \cos^2 \theta-1=1 - 2 \sin^2 \theta$

$\sin^2 \theta = \frac{1 - \cos 2 \theta}{2}$

$\cos^2 \theta = \frac{1 + \cos 2 \theta}{2}$

temp

[http://tw.asus.com/products4.aspx?l1=3&l2=12&l3=31&model=180&modelmenu=1 P4P800]

Album

[http://www.flickr.com/photos/feb30th1712/ Flickr]
[http://www.pixnet.net/feb30th1712 Pixnet]

Blog

[http://CarnDen.blogspot.com/ Carnivorous garden]
[http://Feb30th1712.blogspot.com/ 二月卅日]

Bookmark

[http://del.icio.us/feb30th1712 del.icio.us]

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