10 lines
248 B
Markdown
10 lines
248 B
Markdown
# Double Angle Identities
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$$ \sin(2\theta) = 2\sin\theta\cos\theta $$
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$$
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\begin{matrix}
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\cos(2\theta) = \cos^2\theta - \sin^2\theta\\
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= 1 - 2sin^2\theta\\
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= 2cos^2\theta - 1\\
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\end{matrix}
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$$
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$$ \tan(2\theta) = \dfrac{2\tan\theta}{1-\tan^2\theta}$$ |