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In Delta ABC Prove that cos A + co...

In ` Delta ABC ` Prove that
` cos A + cos B+ cos C =1 + ( r ) / ( R ) `

A

` 1 - ( R )/( r ) `

B

` 1- ( r )/( R ) `

C

` 1+ ( R )/( r ) `

D

` 1 + ( r )/( R )`

Text Solution

Verified by Experts

The correct Answer is:
D
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