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In a triangle ABC the expression acosBc...

In a triangle ABC the expression `acosBcosC+bcosC cosA+c cosA cosB` equals to :

A

`(rs)/(R )`

B

`(r )/(sR)`

C

`(R )/(rs)`

D

`(Rs)/(r )`

Text Solution

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The correct Answer is:
A
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