In a \( \triangle A B C \), prove that Chap 01 Trigonometric Functions and Identities \[ \sum_{r...

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In a \( \triangle A B C \), prove that
Chap 01 Trigonometric Functions and Identities
\[
\sum_{r=0}^{n}{ }^{n} C_{r} a^{r} b^{n-r} \cos (r B-(n-r) A)=c^{n} .
\]
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