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Sine of Sum of Three Angles
## Formula
If:
$$A+B+C=\pi$$
then:
$$\sin(A+B+C)=0$$
Therefore:
$$\sin(A+B)\cos C+\cos(A+B)\sin C=0$$
## Usage
- Used to derive identities involving the angles of a triangle.
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Sine of Sum of Three Angles
## Formula
If:
$$A+B+C=\pi$$
then:
$$\sin(A+B+C)=0$$
Therefore:
$$\sin(A+B)\cos C+\cos(A+B)\sin C=0$$
## Usage
- Used to derive identities involving the angles of a triangle.
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