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Q)

In a $\Delta ABC, \; \cos A+ \cos B + \cos C$ is equal to :


( A ) $\frac{1}+ \frac{R}{r}$
( B ) $1-\frac{r}{R}$
( C ) $1+\frac{r}{R}$
( D ) $1-\frac{R}{r}$

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