In any ` A B C` , prove that: `(b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c`

This is the Solution of Question From RD SHARMA book of CLASS 11 CHAPTER TRIGONOMETRIC FUNCTIONS This Question is also available in R S AGGARWAL book of CLASS 11 You can Find Solution of All Question From RD SHARMA and R S AGGARWAL book from class 6-12 on our app DOUBTNUT for Free



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==== QUESTION TEXT ====

In any ` A B C` , prove that: `(b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c`

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