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কোন সূত্রটি সঠিক -

\sin (\frac{B}{2}) = \sqrt{\frac{(s - c) (s - a)}{c a}}

\tan (\frac{B}{2}) = \sqrt{\frac{(s - c) (s - a)}{s (s - b)}}

\cos (\frac{C}{2}) = \sqrt{\frac{s (s - c)}{a b}}

সবগুলো

ANS : 4

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