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In this video, you will learn about the proof of the angle sum formulas.

--questions--

--text--

What is the angle sum formula for sine?

--answers--

$\sin(a + b) = \sin(a)\cos(b) + \cos(a)\sin(b)$

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$\cos(a + b) = \cos(a)\cos(b) - \sin(a)\sin(b)$

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$\tan(a + b) = \frac{\tan(a) + \tan(b)}{1 - \tan(a)\tan(b)}$

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$\sin(a + b) = \sin(a)\cos(b) - \cos(a)\sin(c)$

--video-solution--

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