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In any !ABC ,If cot(A/2),cot(B/2),cot(C...

In any `!ABC` ,If `cot(A/2),cot(B/2),cot(C/2)` are in A.P.,then a,b,c are in

A

A.P.

B

G.P.

C

H.P.

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Exercise
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  2. If in a DeltaABC ,a sin A=b sin B, then the triangle, is

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  3. In any !ABC ,If cot(A/2),cot(B/2),cot(C/2) are in A.P.,then a,b,c are...

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  4. In any !ABC b^(2)sin2C+c^(2)sin2B=

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  6. If in a triangleABC , Delta=a^(2)-(b-c)^(2),then tan A=

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  7. If the angles A,B,C of a triangle are in A.P.and sides a,b,c are in G....

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  13. In a triangle ABC ,angle A is greater than B.If the measures of angles...

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  14. If in a triangle ABC , 2(cosA)/a+(cosB)/b+2(cosC)/c=a/(bc)+b/(ca), ...

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  15. If A gt 0 ,B gt 0 and A+B=pi/3,then the maximum value of tan A tan B ,...

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  17. If sin beta is the GM between sin alpha and cos alpha, then cos 2beta ...

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  20. In a !ABC , sin A + sin B + sin C = 1+sqrt2 and ,cos A +cos B +cos C =...

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