If sin theta = a/(b+c) then show that co...

If `sin theta = a/(b+c)` then show that `cos theta = (2sqrt(bc))/(b+c) cos ((A)/(2))`

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If sin theta = a/(b+c) then show that cos theta = (2sqrt(bc))/(b+c) co...
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In a DeltaABC" if " a =13,b=14,c=15 " then show that " R =(65)/(8),r=4...
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If r(1) = 2, r(2) = 3, r(3) = 6 and r =1, prove that a = 3, b=4 and c ...
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