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Show that cot ""(A)/(2) + cot "" ...

Show that
` cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2) = (S^(2))/( Delta ) `

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The correct Answer is:
`(s^2)/( Delta )`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PROPERTIES OF TRIANGLES-TEXTUAL EXERCISES ( EXERCISE - 10(a) ) III.
  1. Show that cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2)...

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  2. Prove that tan.(A)/(2)+tan.(B)/(2)+tan.(C)/(2)=(bc+ca+ab-s^(2))/(Delta...

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  3. ( cot ""(A)/(2) + cot ""(B)/(2)+ cot ""( C )/( 2))/( cot A + cot B + ...

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  4. In Delta ABC, sum (a+b) tan ((A-B)/2)=

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  5. b-c // b+c cot A/2 + b+c // b-c tan A/2 = 2 cosec (B-C)అని చూపండి.

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  6. If sin theta = a/(b+c) then show that cos theta = (2sqrt(bc))/(b+c) co...

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  7. If a=(b+c)costheta, " then prove that" sintheta=(2sqrt(bc))/(b+c)cos((...

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  8. In Delta ABC, b cos (C+ theta)+c cos (B- theta)=

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  9. If the angles of triangles ABC are in A.P. and b: c= sqrt3 : sqrt2 "...

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  10. If (a^(2)+b^(2))/(a^(2)-b^(2))=(sinC)/(sin(A-B)) , then S.T . DeltaAB...

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  11. In Delta ABC, if cos A+cos B+ cos C=3//2, then the triangle is

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  12. If cos ^(2) A + cos ^(2) B = cos ^(2) C = 1 then show that Delta A...

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  13. In a /\ABC if a^(2)+b^(2)+c^(2)=8R^(2) then show that/\ABC is a right ...

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  14. In Delta ABC , if cot "" (A)/(2) , cot "" ( B)/(2) , cot "" (C )/(2...

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  15. If sin^(2).(A)/(2)+sin^(2).(B)/(2)+sin^(2).(C)/(2) are in H.P , show t...

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  16. C=90^(0) అయితే, (a^(2) + b^(2) // a^(2) - b^(2)) sin (A- B) =1 అని నిర...

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  17. a^(2) sin 2C + c ^(2) sin 2A =

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  18. A lamp post is sittuated at the middle point M of the side AC of a tri...

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  19. Two ships leave a port at the same time . One goes 24km per hour in th...

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  20. A tree stands vertically on the slant of the hills From a point A on t...

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