Write the Formula of SinC + SinD = ? And Sin3theta = ?

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These formulas were derived with the help of the addition theorems.

\(sin\ C+sin\ D=\color{blue}2sin\ \frac{C+D}{2}cos\ \frac{C-D}{2}\\ sin\ 3\theta=\color{blue}3sin\ \theta-4sin^3\theta \)

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