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If 2 cot ""( B)/(2) = cot "" (A) /( 2) ...

If `2 cot ""( B)/(2) = cot "" (A) /( 2) + cot "" ( C )/(2) ` then a,b,c are in

A

` A.G. P `

B

` G.P `

C

` A.P `

D

` H. P `

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - 1
  1. In Delta ABC, (b-c)^2 +4bc sin^2 (A//2)=

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  2. If 2 sin ""( A) /( 2) sin ""( C)/(2) = sin "" ( B) /(2) then a,b,c ...

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  3. If 2 cot ""( B)/(2) = cot "" (A) /( 2) + cot "" ( C )/(2) then a,b,...

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  4. In Delta ABC, if 3 tan ""A/2 tan""C/2=1 then a,b,c are in

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  5. Show that Delta =(a^(2))/( 2( cot B+ cot C ) )

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  6. a^(2) sin 2B+ b^(2) sin 2A =

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  7. If c^(2) = a^(2) + b^(2) then 4s ( s-a) ( s-b) ( s-c) =

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  8. ((a^(2) - b^(2) sin A sin B) /( 2 sin ( A- B)))

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  9. a cot A + b cos B + c cos C =

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  10. ( x) /( y ) + (y)/(z) , ( z)/(x) + (z)/(x) + (x)/(y) then the area of...

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  11. In Delta ABC, if a= 2, B=120^@, C=30^@, then the area of the triangle ...

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  12. The diameter of the circumcircle of the triangle whose sides 61,60,11 ...

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  13. If the length of side of an equilateral triangle is 10cm , then R =

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  14. If a cos B = b cos A then the triangle is

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  15. If a = 40 , c= 40 sqrt3, B = 30 ^(@) then nature of triangle is

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  16. In DeltaABC, " if " cos A=( sin B)/( 2 sin C) , then the triangle is

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  17. If ( a^(2) + b^(2))/( a^(2) - b^(2)) = ( sin C)/( sin (A- B)) then tr...

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  18. sum (b^(2) -c^(2))/( a^(2)) sin ^(2) A =

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  19. sum (a^(2) sin ( B- C ))/( sin B+ sin C) =

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  20. In Delta ABC, sum a^2 (cos^2 B-cos^2 C)=

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