User:Feb30th1712

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Currently reading 計算機概論第六版(Template:ISBN).

Math

File:Unit circle angles.svg

The unit circle

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

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

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

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

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

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

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

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

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

temp

P4P800

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• 二月卅日

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