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किसी `Delta ABC` में , यदि `a=3,b=5,c=6`, तो सिद्ध कीजिए - `cos .(A)/(2)=sqrt((14)/(15))` तथा `cot.(A)/(2)=sqrt(14)`

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किसी `Delta ABC` में , यदि `a=3,b=5,c=6`, तो सिद्ध कीजिए - `cos .(A)/(2)=sqrt((14)/(15))` तथा `cot.(A)/(2)=sqrt(14)`
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`s=(a+b=c)/(2)=7`, इसलिए `cos.(A)/(2)=sqrt((s(s-a))/(bc))=sqrt((7xx(7-3))/(5xx6))=sqrt((28)/(30))`
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