JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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Application +4 | -1

In a

\triangle A B C, \cos A+\cos B+\cos C

is equal to

View answer and explanation

Correct option: D

1+\frac{r}{R}

Option D (

1+\frac{r}{R}

) is correct because by using trigonometric identities and the relationship between inradius, circumradius, and angles, the expression simplifies to

1+\frac{r}{R}

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