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In a triangle ABC...

In a triangle ABC

A

sinA. sinB.sinC `=Delta/(2R^(2))`

B

sinA.sinB.sinC `=r/(2R)(sinA + sinB + sinC)`

C

`a cosA + b cosB + c cos C= (abc)/(2R^(2))`

D

`sinA. sinB.sinC = R/(2r)(sinA + sinB + sinC)`

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A, B
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