User:Feb30th1712

Wikipedia:Babel
en-3 This user is able to contribute with an advanced level of English. ja-1 この利用者は少しだけ日本語ができます。 zh 該用戶的母語是中文。 该用户的母语是中文。
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Currently reading 計算機概論第六版(ISBN 986-421-565-5).

Math

The unit circle

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

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

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

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

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

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

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

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

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

temp

P4P800

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• 二月卅日

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