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$\cos \frac{A}{2} =$ কত?

\sqrt{\frac{s (s - a)}{b c}}

\sqrt{\frac{(s - b) (s - c)}{b c}}

\sqrt{\frac{b c}{s (s - a)}}

\sqrt{- \frac{b c}{(s - b) (s - c)}}

ANS : 1

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